Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa1968c6b409d97…

MALICIOUS

PDF

70.9 KB Created: 2021-02-17 11:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 02ba0349bc776861e0d724d75a5731f3 SHA-1: f277d2ee7410e2c76ad5c036e296cbe1e839d2da SHA-256: 4fa1968c6b409d97cdd602a7f450752639c9714406056d1e18f136a5f8369042
146 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with several pointing to suspicious domains and one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scam purposes. The presence of external URIs and the callback lure heuristic further support this assessment.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://maypoin.ru/wix?keyword=nascla+contractors+guide+oregon+audiobook PDF link annotation
    • https://cdn.sqhk.co/vaxarogajib/hjIjgJO/famous_for_followers_likes_fans_tiktokers._com.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470836/normal_5fd707271ba18.pdfIn PDF document text
    • http://vosalax.22web.org/consulting_report_outline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5ff31b7417cf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_601e09ad21926.pdfIn PDF document text
    • http://chatik85939775.fun/gikigobaxugexodyls7r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_6011ac74426c4.pdfIn PDF document text
    • http://chaptejvxz.fun/66652233947xsl2j.pdfIn PDF document text
    • http://it50life.pro/80188759713sk614.pdfIn PDF document text
    • http://scandisvet.ru/suwekuwutd40wm.pdfIn PDF document text
    • https://cdn.sqhk.co/figotabam/hhijPgc/2_player_games_tug_the_table_unblocked.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/dozuga/advanced_life_support_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/fuji_xerox_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/kapumodukom.pdfIn PDF document text
    • http://zaluboxif.epizy.com/jezeduginupuf.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/article_rewriter_wizard.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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 5280 bytes
SHA-256: ad37f23173081f67085a14c256f17a0990a9b352eacab1e54ded58dd43262d46
font_01_sfnt_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 10876 bytes
SHA-256: 88e691f64672a4dba1d676dc36e6795536aa0159c9477b91890d5c2be91cd518

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