Malicious PDF — malware analysis report

Static analysis result for SHA-256 1683145c380cda94…

MALICIOUS

PDF

72.3 KB Created: 2021-01-21 16:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d4c63f1b6328a0f962e2693683662ac0 SHA-1: 4923b9cee1ec92c341f42d4a941a04b1b3f6a464 SHA-256: 1683145c380cda949e1bd3d273fb552ea66c54e06b227abc8520de1988539e32
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary goal appears to be redirecting users to potentially malicious external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffset.ru/123?utm_term=conectores+del+discurso+pdf PDF link annotation
    • https://cdn.sqhk.co/wabajevebe/S2ihjbV/efootball_pes_2021_mobile_app.pdfIn PDF document text
    • https://nubodizigo.weebly.com/uploads/1/3/5/3/135346475/wofijo.pdfIn PDF document text
    • http://vebejisidag.66ghz.com/lukuxuzalaxumaparotezuj.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/iibgegd/mobile_service_coaching_centre_in_chennai.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/80f8b5dafe.pdfIn PDF document text
    • https://site-1177111.mozfiles.com/files/1177111/sound_blaster_crystal_voice_not_working.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/9091965.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/rovobufefelim_mupagejaw.pdfIn PDF document text
    • https://tarebizadutobi.weebly.com/uploads/1/3/4/3/134310067/dufelefidewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://deketinak.rf.gd/patient_assessment_form_physiotherapy.pdfIn PDF document text
    • http://xuvafinuvewabek.epizy.com/sheet_pile_cofferdam_cost.pdfIn PDF document text
    • http://garuwefusu.epizy.com/ac_market_free_2019.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_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 4844 bytes
SHA-256: 7b613d1da2a2e904da1737775a44047a23cc4438284be3fd75f29bc2c4284cb2
font_01_sfnt_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 11096 bytes
SHA-256: 329bba6d9a664404784e708544dc6741a85561d9440dc52ef3c0f933b8c9ef33

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