Malicious PDF — malware analysis report

Static analysis result for SHA-256 31992272ee13d4ad…

MALICIOUS

PDF

79.3 KB Created: 2021-02-04 14:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 616adbf89069499885b8d68b84f44f93 SHA-1: 46fae2534bb4213abb60e25e3e5d36dc9db9396c SHA-256: 31992272ee13d4ada0428ecdc28400b9d0821c1e6c19110e33c8e2b3c03e8ee3
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://yafferge.ru/aws?utm_term=peroxido+de+benzoilo+forma+de+uso In PDF document text
    • http://rofodas.22web.org/10527376706.pdfIn PDF document text
    • https://cdn.sqhk.co/xanikadir/ziggRlQ/centurylink_outage_portland_today.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/fxEgehd/metujel.pdfIn PDF document text
    • https://dujemezore.weebly.com/uploads/1/3/1/3/131381607/mibeti.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/XhgT3hc/wavibepidi.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/QyFXOgh/throne_of_glass_books_age_rating.pdfIn PDF document text
    • http://rutopadazemed.22web.org/distinguishing_between_atoms_answers.pdfIn PDF document text
    • http://zomuregunaradu.iblogger.org/race_for_life_shop_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/R09Iyom/dasupa.pdfIn PDF document text
    • https://cdn.sqhk.co/fuludasowipu/ehjgdhe/lightning_vs_islanders_highlights_game_4.pdfIn PDF document text
    • https://cdn.sqhk.co/pabulibig/QSJYjbI/50343178579.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/eVhhxgj/anxiety_disorder_definition_psychology.pdfIn PDF document text
    • http://sujatafuluwariv.22web.org/nigerian_gross_domestic_product_report_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sifebina.epizy.com/28173800715.pdfIn PDF document text
    • http://watuginidimefil.epizy.com/11895797899.pdfIn PDF document text
    • http://zufagubiles.epizy.com/21915066502.pdfIn PDF document text
    • http://nirirojigupe.epizy.com/case_in_point_10th_edition.pdfIn PDF document text
    • http://darozux.epizy.com/calling_bell_sound_ringtone.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 5116 bytes
SHA-256: 91d8f800f0f0800fa13604d9a9dbe6099f6c3ce56fde28be588e55296d262b8e
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 11524 bytes
SHA-256: 0a7626f5b2a1b6caf4b96e0d649675a8fa4393fd853353e56889b46d936f92f1
font_02_sfnt_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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