Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9ded98da928985…

MALICIOUS

PDF

72.9 KB Created: 2020-11-13 22:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 044a0b9b6bb3fc38b70c9d021a31df9c SHA-1: d396cd135edf32f84bfb51aa4acfbdaa7d0494ad SHA-256: 3c9ded98da92898535d614ae6f13f79eea4242924585bc6947c140316a4d545e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffking.ru/123?utm_term=clean+ui+pro+full+version+apk PDF link annotation
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/75bc269f5056.pdfIn PDF document text
    • https://sigakoge.weebly.com/uploads/1/3/4/4/134437147/xunako.pdfIn PDF document text
    • https://mavevataxivira.weebly.com/uploads/1/3/4/6/134600118/2224220.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/nugedub.pdfIn PDF document text
    • https://liwufetut.weebly.com/uploads/1/3/4/5/134596667/a8f5ce716.pdfIn PDF document text
    • https://www.apk4fun.com/apk/37314/ChooseIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bajuse/free_clipart_curious_george.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/nopagekuxakojanulozivabum.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/company_profile_interior_design_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297957a8-957a-4efc-9e9a-130b3a120891/electrical_operation_and_maintenance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eedb8969-9b39-46b3-89fe-707014a074b7/75669494013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7416fa76-f65c-4f37-affa-3a2d3bbed948/67318252711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4c8afb-a0e6-4b33-9f21-40a651179070/vunasobudixata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfe7998-c2a9-4d1b-8a5b-62851e0f7426/trevor_schlingheyde_obit.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/77177953078.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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 4924 bytes
SHA-256: 6db844ab1fc059421cb4f6a772487eb90441b604e498af2782e8ddc84d542189
font_01_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 11392 bytes
SHA-256: 2892aa96b7def88a37b07441d9a90b64fda3f30935198dc14ed76b4ef5b84246

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