Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f0aaf3536d42de…

MALICIOUS

PDF

69.4 KB Created: 2021-02-15 22:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c1bfd3233c60c7b3a3b20ca02d696dfb SHA-1: be13a8343abba11c26df2ab760b9e83702414388 SHA-256: 14f0aaf3536d42de043e5341d847a68bbff3fbcab7e5bd8380c680b4cf11efc9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wb?keyword=rime%20of%20the%20ancient%20mariner%20lyrics%20maiden PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409421/normal_5fd173fbd7bc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5ffc173d24e8f.pdfIn PDF document text
    • https://cdn.sqhk.co/dakizenewa/bijjjPF/77758911818.pdfIn PDF document text
    • https://cdn.sqhk.co/piwewupovo/jUeJCPn/75295514084.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/tidjcDC/hashtags_for_instagram_facebook_twitter_linkedin_meme_template.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/kphetih/5305525086.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/bnlcWry/notosewumafobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408989/normal_5fed6fbab9aa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_60182fd7932d6.pdfIn PDF document text
    • http://decideyouself.fun/tonemedesakoluxakf4pzg.pdfIn PDF document text
    • https://cdn.sqhk.co/pazibafax/jgFhan1/ebay_bid_sniper_free_uk.pdfIn PDF document text
    • http://leyloften.online/tixetexigutugevibixifix2bbw5.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/OvBKBib/2_dice_roller_1-_6.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/yiahghh/kaiser_permanente_flu_shot_2020_santa_clara.pdfIn PDF document text
    • http://musc-media.xyz/median_xl_guides2vrng.pdfIn PDF document text
    • https://cdn.sqhk.co/giravopakiw/ejbilhh/gladiator_glory_mod_game.pdfIn PDF document text
    • http://avtovishki-msk.ru/640828555888u2ij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejexapef.rf.gd/netonazop.pdfIn PDF document text
    • http://zigexejumex.epizy.com/21854094083.pdfIn PDF document text
    • http://kigapamoxatiw.epizy.com/performance_appraisals_definition.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_off0000d43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43F 5372 bytes
SHA-256: 50dad26a8952e57c00a9faf17f785fe9b4b03e25a46fc6a53d771fd535ecdec4
font_01_sfnt_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 9908 bytes
SHA-256: c73f56f153ead2bb72aa8febedba8cc1587842d8a86f15dcc0887cda76149510

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