Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cee804b0d70cc44…

MALICIOUS

PDF

83.9 KB Created: 2021-04-25 00:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e003b1f7135ad1088bfef3bbc03d4bf7 SHA-1: ecaf78bc77e9406457d7f539caa5af4ee1bc0cd7 SHA-256: 6cee804b0d70cc44d029e26aba967902bbc48c05e85ba7005634b990f2737bf4
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains and potentially malicious redirectors, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure suggests an attempt to lure users to external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=angelcare+bath+booster+seat In PDF document text
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/gozefej.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/baxasubasixewawipigibaiadid.pdfIn PDF document text
    • https://duvirimak.weebly.com/uploads/1/3/4/6/134603536/fudapusot.pdfIn PDF document text
    • https://xomivumikeso.weebly.com/uploads/1/3/0/7/130774979/8590267.pdfIn PDF document text
    • http://arfesopt.com/ford_locking_hubs_maintenancei9814.pdfIn PDF document text
    • http://gufutaca6.xyz/how_to_set_timer_on_intermatic8mait.pdfIn PDF document text
    • http://kushtanash.ru/amu_online_form_last_date_2018ryghx.pdfIn PDF document text
    • https://wemodolitafuroj.weebly.com/uploads/1/3/6/0/136055174/7447488.pdfIn PDF document text
    • https://melezejezoman.weebly.com/uploads/1/3/5/3/135383670/c1aa709.pdfIn PDF document text
    • http://weareanonymous.org/lekexitobodikadazolsz65y.pdfIn PDF document text
    • https://rolavakewuxilo.weebly.com/uploads/1/3/1/4/131407047/34a49c807e0.pdfIn PDF document text
    • http://formulamoney.top/how_to_search_google_by_image_size946oz.pdfIn PDF document text
    • https://xubajibagi.weebly.com/uploads/1/3/1/3/131378916/1640748.pdfIn PDF document text
    • http://fresh-ita.fun/the_art_of_the_deal_book_amazonfrw2i.pdfIn PDF document text
    • https://volexerakonoza.weebly.com/uploads/1/3/4/7/134713377/1741918.pdfIn PDF document text
    • https://furadigiwib.weebly.com/uploads/1/3/1/4/131407367/dalosurokon.pdfIn PDF document text
    • http://naturagrush.space/mugujabivixemugwqi8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_2e6a7a0e9b324e68b493a5bd292ad3ec.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_35efc0c8eedf448da64a3a2ab09d9c63.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_fd7e37ce1bfe4f9d890066d7112cbc4c.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_e35d08a5cdd44eb593ad81a49107c06d.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_c151575bf9fa46778c3a169c86435386.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_cae2adf3de2d48719f79199b6d9364eb.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_dd9a8e3b7eb54948823ebce6d66817d6.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_3fb2e72bdd334526bec06540c827cb4a.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_0d2c0511284c43b8b4f39a908c438d37.pdf?index=trueIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_0e0d03313c734bc18a1ca64322f1e4a5.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 5192 bytes
SHA-256: 98df1c37a92f693fc61c21b0e66027238d5f853b6dab35f77a74cfbca5f20ae4
font_01_sfnt_off00011827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11827 12108 bytes
SHA-256: 03e431fdf7ad905a44a70b66afd7496c77540d8bd87b7167d8b029c47662294c

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