Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a55776c4f6263cc…

MALICIOUS

PDF

74.1 KB Created: 2021-03-28 19:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 510ab6bea462935f684769ef9c859165 SHA-1: 6b1812d44cbceea8749bde3c39771a104ce570e8 SHA-256: 1a55776c4f6263ccd20829cdd54cf6e1f7be52b4f15cc806e434d93302015e81
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to various domains, some of which are disposable or associated with link farms, further supporting the malicious classification.

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://kuzutuzo.ru/award?keyword=ableton+live+9+tutorial+espa%25C3%25B1ol+pdf PDF link annotation
    • https://cdn.sqhk.co/fowipovoji/jgrRrzP/dream_league_soccer_2020_fifa_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/jhfRZfA/ahlat_agac_kamera_arkas.pdfIn PDF document text
    • http://nasty666.space/xfinity_remote_control_codes_for_vizio_tv3ngnt.pdfIn PDF document text
    • https://cdn.sqhk.co/buganixezu/gjjiihf/pufokuvonaxuxolijugito.pdfIn PDF document text
    • http://magazinrf.xyz/vegolisimirivenshka.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/jjfI1gc/49624603059.pdfIn PDF document text
    • http://salonapp.xyz/702668828mx85k.pdfIn PDF document text
    • http://moitender.org/6001039181376x4q.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/jegejet/52816286152.pdfIn PDF document text
    • http://presentinsta.online/shadowkeep_release_date30xl7.pdfIn PDF document text
    • https://cdn.sqhk.co/vogigoda/TOieVic/jadubesuwuvi.pdfIn PDF document text
    • http://vzroslyh.net/tivisomubigoza5u7qn.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/jchc232/61014032251.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/94Nhfif/game_creator_demo_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/GifhfJw/kikibu.pdfIn PDF document text
    • http://natlab.ru/los_2_periodos_de_la_historia_natural_dela_enfermedadxtvov.pdfIn PDF document text
    • https://cdn.sqhk.co/jasekazus/hbjaHhx/19090834203.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_f1bd060281894df5bcb67ebbf09f22cd.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_008ab34c86134aa39dc2da882e7fc705.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_e43f0ee74ca04436959c1a1caf630b14.pdf?index=trueIn 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_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 5592 bytes
SHA-256: 06348097d06b4d2044e3b286de136272ac1b161bb202f513de054fa1e437f06f
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 11132 bytes
SHA-256: 2590a7d48f4b6500e23c2be4f850042e8ce56845d62ee261fabae5340f0d6296

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