Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aaf57497a2870c…

MALICIOUS

PDF

88.6 KB Created: 2021-04-08 16:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1efcf33b14aaee84446f21bf2f50ae0b SHA-1: a4b147067268fa7af458d559789c472ec6f6eff3 SHA-256: a6aaf57497a2870c42338868ac98e9c6adb7d1aa444c27b8297ee1fbf2eb14e8
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://druttle.ru/strik?utm_term=sleight+of+mouth+patterns', and other URLs like 'http://anarchymedya.com/3220661402911gn1.pdf' are suspicious and likely lead to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is used to host these links.

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://druttle.ru/strik?utm_term=sleight+of+mouth+patterns PDF link annotation
    • http://anarchymedya.com/3220661402911gn1.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/7ASjgij/panda_pop_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/c8yDQgc/fall_guys_running_faster.pdfIn PDF document text
    • http://temppicture.xyz/xatenukunum4kc5e.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/iaBhcjh/34431652718.pdfIn PDF document text
    • http://soul-felt.com/who_qualifies_for_maternity_allowance9ffh6.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidaxiwuk/MenTjbY/lagasigerev.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/87178250956.pdfIn PDF document text
    • http://spindlndou.space/35390126691990hh.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/fghgdic/naxanegijavefokesemez.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/Fhelruh/82658980076.pdfIn PDF document text
    • http://zuxuvikewi.sportsontheweb.net/bruchrechnen_aufgaben_klasse_6.pdfIn PDF document text
    • https://cdn.sqhk.co/niturunajik/rjhegiv/nokudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_22d081a215a3445c977bea57d12d42e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bufexa/ab-_soul_these_days.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_5620a312a1fe46bdb1c49df5db82ed5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/58218820904.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/corrective_preventive_action_log_sheet.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 5416 bytes
SHA-256: e3ee7e8ed4f8fff7923b377416641a65477d21c70f42968f76a9e2aa5dc9be3a
font_02_sfnt_off00012dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCC 11004 bytes
SHA-256: 71cd7dd8a48b14e93147b211d5927e4592ca582ed0d7e5e8681ff128b9569f71

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