Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1d0ba777157327…

MALICIOUS

PDF

67.9 KB Created: 2021-06-09 01:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c76e2d57056787e46925e576db3d4fc6 SHA-1: 54b2169072f9b1751c87a585d739b4cfcd80cd65 SHA-256: 1f1d0ba777157327e1ec54fb24dbf439bf27f8d517d393a04bd97fa6085cb595
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm designed to redirect users. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be instructing users to decrypt an archive, a common tactic for evading gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/pbw?utm_term=que+le+paso+al+lunes+pelicula+completa PDF link annotation
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/3750034.pdfIn PDF document text
    • https://vojufutevale.weebly.com/uploads/1/3/4/5/134521456/5575064.pdfIn PDF document text
    • https://kexiruti.weebly.com/uploads/1/3/4/7/134719605/tugokidadefuv.pdfIn PDF document text
    • https://karomigotel.weebly.com/uploads/1/3/5/9/135962203/394d043a6.pdfIn PDF document text
    • https://pufegigan.weebly.com/uploads/1/3/1/0/131070168/1272227.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/sukowadevesexoner.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144710763/how_to_calculate_the_chiller_capacity.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/w/file/fetch/144553014/first_steps_in_music_theory.pdfIn PDF document text
    • http://najajadux.pbworks.com/f/crunchball_3000_unblocked_games.pdfIn PDF document text
    • http://sokulus.pbworks.com/f/jepitujivafekajafivef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897ec7ff-3df2-42a6-914f-48e675acacdd/super_systems_op-3_oven_proofer_parts.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/f/palabras_de_condolencias_para_una_amiga_que_fallecio.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/48753483697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577d8e4c-1637-4377-846a-ae4b7cf495c3/1964406445.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/xuwelavonalefunil.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2F 5044 bytes
SHA-256: 66caf3790bc8433ad3f457f71482408929a99a49c8949b7e3dcbe5d7eb3ad32b
font_01_sfnt_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 12052 bytes
SHA-256: 021a9ff2100805770c3bb9fca005708d57bcd15262c18ad7a3ac0876ab087c7a

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