Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f2637af03d11da…

MALICIOUS

PDF

74.1 KB Created: 2021-04-08 06:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a48d76fb78e1e4150f7f01c91e0e3cdf SHA-1: bd0a1bc6f4dc62c6b3a1ce9247821292fbc0c9c6 SHA-256: f7f2637af03d11da6e493003697f5ba2a5866886418145ec99c5f9d2ec43d2e5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests this is a link farm designed to host malicious content. While no scripts were explicitly extracted, the ML classifier and ClamAV detection confirm malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=save+smaller+pdf+illustrator PDF link annotation
    • http://kemedejovon.getenjoyment.net/71886675391.pdfIn PDF document text
    • http://idealica-italiauficiale.website/51154226027xt42f.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/6628879365.pdfIn PDF document text
    • http://ital-tess.space/71593603808a75ab.pdfIn PDF document text
    • http://kivikevakefum.22web.org/boruwumumijizuterozadebez.pdfIn PDF document text
    • http://xujadawowupu.scienceontheweb.net/72037879336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485935/normal_60065d53b9d61.pdfIn PDF document text
    • http://zazerabila.iblogger.org/articles_of_incorporation_arizona_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_6014e4883d5fe.pdfIn PDF document text
    • http://rivoduzajoki.iblogger.org/visual_studio_android_emulator_alternative.pdfIn PDF document text
    • http://noverst.xyz/find_venmo_account_number2kjht.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415937/normal_602be8e7e9ad1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fccacc95d00c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fifuto/21851186045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb4a209-0fbd-48c4-bb93-4be1b693ef93/4779701229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98cce7ba-df22-48f7-a0e0-522f19adc660/how_to_purchase_money_market_fund.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/76140659738.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/povotatanowiteleto.pdfIn PDF document text
    • http://fezimebuwoki.rf.gd/st_caste_list_in_up.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/best_squarespace_template_for_photographers_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/daraz._com._bd_app.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 5348 bytes
SHA-256: 787ad0a7903774ce1b045ef71792bd8ad5fa909725f81cc1ed970d614cc53f30
font_01_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 11016 bytes
SHA-256: b9e409aeaa28690824e1aa6da1d9cc84e15f2241fa68fde6c5a84df69964e1d6

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