Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3fa336a0611027…

MALICIOUS

PDF

74.0 KB Created: 2021-01-30 22:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4a74ee33a0dc4a6291a94c92b7607217 SHA-1: e76a390c6993246d9c4d57a4c820e9b3e6c65287 SHA-256: fb3fa336a0611027eca57a4cf9e043721935ff5eb671cdf10a1bad497d2c4faf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains and potentially malicious content, as indicated by ClamAV and ML detection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing/malware. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=strongest+summon+weapon+terraria PDF link annotation
    • http://teenagetutor.net/tuloxitajivorase7xg90.pdfIn PDF document text
    • https://cdn.sqhk.co/xafigozenusu/ZgjmBo0/shark_ion_robot_r87_vs_roomba.pdfIn PDF document text
    • http://fezibinuzot.iblogger.org/tonegujulejotozitepikupa.pdfIn PDF document text
    • http://nobelopagix.22web.org/namomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fed320a378dc.pdfIn PDF document text
    • http://bitjoms.xyz/49764773959gnu4c.pdfIn PDF document text
    • http://mandarin-fruit.space/88415257768dq2q8.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/bhbhdhf/27413734654.pdfIn PDF document text
    • http://cosmeteca.com/bomber_crew_game_ranksfetuy.pdfIn PDF document text
    • http://takotonefajale.22web.org/arcgis_pro_size.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/bOAjdib/mivegori.pdfIn PDF document text
    • http://classicalnaturally.com/pidezidisovutasavelodlsi0.pdfIn PDF document text
    • http://sefesojobibif.iblogger.org/62743156579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_5fe9f7c8b5db1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifekubipaxo.epizy.com/happy_birthday_coloring_sheets_to_print.pdfIn PDF document text
    • http://zawumowu.rf.gd/57631481673.pdfIn PDF document text
    • http://rifovedukuj.epizy.com/35381781160.pdfIn PDF document text
    • http://kexeban.rf.gd/14718399292.pdfIn PDF document text
    • http://puwodadivuxasaf.epizy.com/66084652206.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_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 5300 bytes
SHA-256: 92eb7f89a83eba43309bf6d7d59c99bf61cc4bb6f24ba06718423b796ad6a634
font_01_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 10528 bytes
SHA-256: d11b2e0752b8579a9c7e8f9f602de10999871ba304fd760190784bfef4272ee3

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