Malicious PDF — malware analysis report

Static analysis result for SHA-256 c120f59cac9aaac4…

MALICIOUS

PDF

70.1 KB Created: 2021-03-01 12:07:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 41ef90bba80326c609c16de9991f6973 SHA-1: 38aabb1ecb60068c46c68d412522a4415b3ba0b4 SHA-256: c120f59cac9aaac4f5c81249a6ff01e2b9674a1c585103adc1719f7272fe6de5
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-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://resalured.ru/123?utm_term=icom+ah-4+for+sale PDF link annotation
    • http://quickpapp.online/32429251336tyx87.pdfIn PDF document text
    • http://hr-insider.com/endeavor_annual_reportsfakg.pdfIn PDF document text
    • http://arenaprobet.com/html_elements_cheat_sheet6blu9.pdfIn PDF document text
    • https://lulexabike.weebly.com/uploads/1/3/1/4/131407361/7058479.pdfIn PDF document text
    • http://znohist.site/90466706841h28k.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/vengeful_spirit_horus_heresyzxrxv.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/uniden_bearcat_trunktracker_iv_bcd996xt.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/lodejemowurer.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/nefevizugedoze.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/4958009.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/sisaxu/regabowozixuguzamupokawu.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/disorders_of_consciousness_clinical_practice_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/complicated_uti_practice_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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 5180 bytes
SHA-256: 52379279b969a69b75511f0aea1e8f5de36fd422c749909142a932261ce9ef83
font_01_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 11372 bytes
SHA-256: 64c6ed8e163c6669f6f6b5e2d79aa7cb1c908cd917cef59c3f23bdef9983cd47

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