Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92007688e5c1d50…

MALICIOUS

PDF

78.9 KB Created: 2021-02-07 11:14:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fb5d635b0015f4667f214945ff549691 SHA-1: 595b82254cd38fd24b71a95230d258401b9664a9 SHA-256: c92007688e5c1d500d784a1f62795388103cac982a7a81bd2b5cb7cc4ae94ef6
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one prominently featuring a lure for 'free autumn wallpapers for android phone'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, specifically as a phishing or trojan. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://bologen.ru/aws?utm_term=free+autumn+wallpapers+for+android+phone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420448/normal_5fee85c111e57.pdfIn PDF document text
    • https://cdn.sqhk.co/retuwami/aziehIk/jibonikiwezitipuduvovo.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/jihf6bW/bitopipetinu.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/djhBzHP/skyrim_dragon_priest_weakness.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_5fd8b8db578fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fd683233bcba.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/848041998781gy5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_6002fca578d0b.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/otjj88g/19734118890.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/muzasemesakedamij.pdfIn PDF document text
    • http://jojisoxig.epizy.com/cautious_noun_form.pdfIn PDF document text
    • http://kepinud.rf.gd/facebook_lite_for_samsung_z2.pdfIn PDF document text
    • http://xodupope.epizy.com/pejikerebe.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_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 5328 bytes
SHA-256: a14703d803fb78a7145e430f77c421e2565e3f70edc4864f96513d7f9231ec66
font_01_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 10968 bytes
SHA-256: d1c475873bf5cd939ecc1f7a85b486437fcfaf26802c7d428f47148b410724c9

Open this report in the interactive analyzer, or submit your own file for analysis.