Malicious PDF — malware analysis report

Static analysis result for SHA-256 917bb378dff12e31…

MALICIOUS

PDF

73.5 KB Created: 2021-04-01 22:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0ce933dfd289c03978fa60884e9843af SHA-1: 22dff789ec2f425c043037eee218b43b83c89d8d SHA-256: 917bb378dff12e318dc5a822be3b2d1212c55223b1f65c937e13a1f18ce36477
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting, suggesting a tactic to obscure malicious destinations. The presence of external URIs like 'https://bologen.ru/strik?utm_term=excelsior+springs+walmart+tire+and+lube' further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=excelsior+springs+walmart+tire+and+lube PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489255/normal_5ff45a0f84481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_5fd14a81c0217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_6035f96810523.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418565/normal_5fe9d2017545b.pdfIn PDF document text
    • http://semengergel.ru/ge_logiq_e10_manualt3zbi.pdfIn PDF document text
    • https://kexarofewif.weebly.com/uploads/1/3/4/5/134505099/e09aa9b1b72a.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/VXA7nha/add_and_subtract_scientific_notation_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/sejukuxa/iar1hi2/superman_returns_game_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_601aac95152da.pdfIn PDF document text
    • http://nikaold.site/801547613170ro05.pdfIn PDF document text
    • http://questotzvezd.space/tokemapi9e4i.pdfIn PDF document text
    • https://wugabatove.weebly.com/uploads/1/3/5/3/135318753/xukakisomenod.pdfIn PDF document text
    • http://italia-doc.fun/wepoxinafofed2q7o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402520/normal_5fe5a8c3bf4c5.pdfIn PDF document text
    • https://genezekanoz.weebly.com/uploads/1/3/1/4/131413678/sonadi_nobot_ligugalo_rewup.pdfIn PDF document text
    • http://jitudowifite.iblogger.org/marketing_environment_book.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/dhb1Pig/26517435350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393755/normal_5fc5a0e321259.pdfIn PDF document text
    • http://itanto.space/epson_stylus_tx230_driver_downloadwuofs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5fed8ed07a5c2.pdfIn PDF document text
    • https://kovibokasekur.weebly.com/uploads/1/3/4/8/134880184/pukurabij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://banamuf.rf.gd/fiximala.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 5532 bytes
SHA-256: 058a9d57db6273e61f48adcd124b8ae68aa7eeeec3767a1316c849a7dc304468
font_01_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 10876 bytes
SHA-256: fecdce52409ca1ab60b0bb2d709c8007d63e24c5fb419e07e4a12d66614e07d6
font_02_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f