Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3243cc34b2b04c…

MALICIOUS

PDF

77.4 KB Created: 2021-05-14 21:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3a3f90cd4770592d4839a449af416146 SHA-1: 52925704dd7f68430b6201bd9a3cdf7c564353b1 SHA-256: 1b3243cc34b2b04ccba055f5fa4a98f0fdb585281b2534c07ccbca4a9282d09a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=is+there+a+way+to+calibrate+a+blood+pressure+monitor PDF link annotation
    • http://worelimupuvefam.mywebcommunity.org/93764809658.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/Jgejfie/gunner_shooter_game_download.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/geomorphology_journal.pdfIn PDF document text
    • https://teditiwos.weebly.com/uploads/1/3/2/6/132681477/3d2d5b2.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/gEwageo/gang_fight_the_party_io_games.pdfIn PDF document text
    • https://xosavufubat.weebly.com/uploads/1/3/4/3/134346154/webosigufili.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/dXhajb5/vajeripodivet.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/8yihHwc/wavigotasimumu.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/dihihpx/47867895031.pdfIn PDF document text
    • https://cdn.sqhk.co/fedijadika/jc27jcr/6220404614.pdfIn PDF document text
    • https://vuveporejar.weebly.com/uploads/1/3/2/6/132695394/2912960.pdfIn PDF document text
    • https://cdn.sqhk.co/retagigimusa/hh8J3hj/mountaineering_gear_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/vudemijugamu/hj7kjgj/83734511456.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_48b5579bcfa944408e3ad3c7b7df2b3f.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_8bfdade61a0041e894950e2d6837ed87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/adverbs_and_expressions_of_frequency_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/lizakibusuxixowobixazux.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/hill-rom_bed_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/18692101531.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/british_english_vs_american_english_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/installation_qualification_guidelines.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_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 5584 bytes
SHA-256: 9524ff45faa5c1654a618ceb110bdb412067fc49879150f7c4feea85d70b1d19
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 10804 bytes
SHA-256: f872fb6977762ba3e8b57d732abb3acb4dbe640237984a2a8d3c542975e578f5

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