Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c61773bd292016e…

MALICIOUS

PDF

76.6 KB Created: 2021-05-05 10:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6e3e3a4be2cd22e6a627b88fd08c6ad8 SHA-1: 1e88023fc8c16dbffadbabad9f5165c8f8510b19 SHA-256: 7c61773bd292016e7e9b85e25c20422f4064e501f61607a6c6ab090174eba282
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xezojetit.ru/strik?utm_term=how+to+do+a+informative+speech+outline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481275/normal_5fe8f639d2384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500674/normal_6068d080574fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491436/normal_6036ce264603b.pdfIn PDF document text
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/89f5fd42e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_6045725ca2ac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_601cba31beaaa.pdfIn PDF document text
    • https://litolojinoforiw.weebly.com/uploads/1/3/4/7/134721995/pajizisajokutixedar.pdfIn PDF document text
    • https://rasiwumuseb.weebly.com/uploads/1/3/5/3/135350461/ff01b1e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409238/normal_5fffb629127a2.pdfIn PDF document text
    • https://gedotelebuguda.weebly.com/uploads/1/3/6/0/136050260/08e405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_5fd110a79bc8d.pdfIn PDF document text
    • https://gikemozepuv.weebly.com/uploads/1/3/0/7/130740444/8e67667a1134488.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fb2216-6874-4eb9-aa23-a52427085bb8/dixulimafejemowem.pdfIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_504457747f324683a0474fb205d393e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/37055211913.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/fortnite_aimbot_pc_2018_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da05dec8-08f2-4380-af53-3190f37b8d8e/how_much_is_a_hyundai_sonata_hybrid_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/53970032145.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/the_bible_exposition_commentary_warren_w_wiersbe_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/garden_answer_june_2019.pdfIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_a3bdeba1184e4aa4964a3a903ca2ebcc.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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 5508 bytes
SHA-256: 76db5c45a17b310c2ff4d3ed7e87799d97f92af250af9d8c1cf97d9eac66f274
font_01_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 10412 bytes
SHA-256: a049433ed3b4900d04e374ae10b1ca81c35c24eaed2cae452ec0bdc51d1f29ec

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