Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54973163a4ea6a9…

MALICIOUS

PDF

84.7 KB Created: 2021-02-21 14:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 39412da3f3e80a762d7da67b10ba1083 SHA-1: 265d150c180f6c27f70e2f83a9362fab82a3f4d8 SHA-256: b54973163a4ea6a96e174427ac137199b252c198e83777934994b1fef55c5eff
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or redirector document. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of a link to a known malicious redirector further supports 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
  • 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/wix?keyword=isabelle+feral+child In PDF document text
    • https://cdn.sqhk.co/vulovosovem/jdh17c7/gatav.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/iejjlet/tetofinilajufukaso.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/a56044d05b.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/hbigXbS/jigafakipukumofezuxatunu.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/9a8d76d8e15bc67.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/xxidGhg/dragon_x1s_goggles_womens.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446027/normal_6009ace41fefb.pdfIn PDF document text
    • https://piwaxokireruber.weebly.com/uploads/1/3/0/9/130969414/523280.pdfIn PDF document text
    • https://nugobobunebiset.weebly.com/uploads/1/3/5/3/135303429/9090086.pdfIn PDF document text
    • http://xaduwojitodefo.66ghz.com/bba_full_form_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/ij8Jgc8/parenting_tips_for_dads_with_daughters.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/cjhgfhe/nascar_speedpark_smoky_mountains_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/aGiighF/64141582558.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445129/normal_5fc8da7782030.pdfIn PDF document text
    • https://cdn.sqhk.co/resasenubori/cwqjhjc/tactical_battle_simulator_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wafubarig.epizy.com/wudezutinaripo.pdfIn PDF document text
    • http://sujimivotabis.rf.gd/vugolixitixofaj.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_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 5184 bytes
SHA-256: b50d57d4d8d9175c3731de800af74feefdafa0d5e1809a2912a243d5eb243172
font_01_sfnt_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 10224 bytes
SHA-256: 01b584ef2b3a9ac73f13d58eb2dc311b1d4544cb0a9f184c96a1412bfbef7e0a

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