Malicious PDF — malware analysis report

Static analysis result for SHA-256 122f843263278bb3…

MALICIOUS

PDF

66.1 KB Created: 2021-02-22 19:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3bc9eaec321a5aee33c8742454dd3de7 SHA-1: ebe18e9e9be6eb36e31a6f2a26f0f60d74851567 SHA-256: 122f843263278bb34818ed7e3fc888b8f8266b9ac8b5d0269c241b8fddac1c26
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of external URIs, specifically 'https://baarspo.ru/strik?utm_term=craftsman+12+gallon+shop+vac+hepa+filter' and 'http://rasprodavaika.ru/mammography_reporting_formatmhh8v.pdf', suggests it is part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains fragments that might relate to product searches, reinforcing the lure aspect.

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://baarspo.ru/strik?utm_term=craftsman+12+gallon+shop+vac+hepa+filter PDF link annotation
    • http://rasprodavaika.ru/mammography_reporting_formatmhh8v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_600d18c203d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_6028b7a7734f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_60185d2f30685.pdfIn PDF document text
    • http://arendagg.xyz/android_save_base64_image_to_filexj4mn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465263/normal_60079e5be277d.pdfIn PDF document text
    • http://healthit.space/nea_puzzle_answerslqtul.pdfIn PDF document text
    • http://swiss-gear-top.xyz/34177267224q94pa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447263/normal_5fdd980c6d6be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486190/normal_5ffd2068b03e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_602e25e03af11.pdfIn PDF document text
    • http://ourfanz.com/1967_ford_mustang_shelby_gt500_for_sale_australia0aghz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fd1ba485cab9.pdfIn PDF document text
    • https://cdn.sqhk.co/fixefalid/icjjbgi/loruwubekigunutefo.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/bipepezuwed/zujumokosipogosijef.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/sage_one_payroll_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/how_to_check_bitmap_size_in_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/edexcel_business_studies_examiners_report_2018.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_off0000c2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D6 5580 bytes
SHA-256: 53dbf54f753f3ae2415246f4fee4986542f96a5cc470555d884f9d37881ac5da
font_01_sfnt_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 11404 bytes
SHA-256: a77442b923c5a56de6a43bcfca3dab446b268fab2564716ff4e4ef53d943b55d

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