Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2da727bb2a4018…

MALICIOUS

PDF

79.3 KB Created: 2021-03-11 22:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a2c70778f5fe033771b750cdd658a7c5 SHA-1: 501ac834f1a585a61f826f865f3b0f7b8e20234a SHA-256: 1b2da727bb2a4018eb24d2eb61de054b63a4a9e09e700988d50eb5ffae7a9929
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=foraminifera+planktonik+dan+bentonik+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408702/normal_601c78b15888d.pdfIn PDF document text
    • http://komarovskii.xyz/julalabx3vna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468261/normal_5fed190823103.pdfIn PDF document text
    • http://kino-vezde.ru/all_coordinate_geometry_formulasfac1y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_603f9493865a1.pdfIn PDF document text
    • http://lishop.site/victoria_secret_secret_angel_perfumez9h36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_601be55f413a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_5fd38a2c21fd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5fe57b5fb999a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_5fd9b1d94fd20.pdfIn PDF document text
    • http://comforfemj.fun/snow_white_witch_gives_appleaxxrt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463807/normal_5fe133525acab.pdfIn PDF document text
    • http://gisimijesizugo.22web.org/electronic_circuit_repair_guide.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/degisapemifa/kenufidunowupijezi.pdfIn PDF document text
    • http://pebabub.rf.gd/refuvedesubopudoxaniterum.pdfIn PDF document text
    • http://wapepot.rf.gd/what_is_the_best_alexa_to_buy_for_music.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/22304232029.pdfIn PDF document text
    • http://puzenufamem.rf.gd/61514467408.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_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 5168 bytes
SHA-256: d60c6402c2540d068d94b54612e7b4ff729749df15b72c16f388cc5068336eda
font_01_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 10032 bytes
SHA-256: 3ec36baaecf4a8571ac407c120e2a0a0f5a248ae78f8286ca50ae376da924bb3