Malicious PDF — malware analysis report

Static analysis result for SHA-256 100a7b0fc978497a…

MALICIOUS

PDF

69.4 KB Created: 2020-11-21 22:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: efad7ea8160d1fc71d0621bb1a0581b3 SHA-1: 14826ea468d46f231adc39667b405ebd4b53fcbd SHA-256: 100a7b0fc978497a3263059146fe83640506d37ea58e8db96a691432f4b2e867
186 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 6

  • 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.
  • 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://traffine.ru/123?utm_term=how+to+cheat+in+dragon+city+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f87209511f7a.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/3409757.pdfIn PDF document text
    • https://vunevodu.weebly.com/uploads/1/3/4/3/134363839/wonefivuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f96c2b2b6a37.pdfIn PDF document text
    • https://lolipakefupixo.weebly.com/uploads/1/3/4/6/134614949/ebcf655.pdfIn PDF document text
    • https://ruwotepileta.weebly.com/uploads/1/3/4/4/134493455/kaxul.pdfIn PDF document text
    • https://zupudawuliwubil.weebly.com/uploads/1/3/4/2/134265939/2999096.pdfIn PDF document text
    • https://wuvozova.weebly.com/uploads/1/3/4/5/134500004/050022447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/724fb5fa-a694-4f95-83c0-818d5c0e345c/20887263788.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/free_movies_online_hd_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/juwexewefazutagekagegexes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5519619-2de8-432a-bbfb-073a3f0417be/23853741161.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/10138254528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45598b0-759e-49ed-9502-39c3a303417b/harrisons_principles_of_internal_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9055391b-01b4-477c-9be7-4f4eb156fd5d/9001866094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6c99fa-9ddb-4afb-8c78-6bd4b90e4455/60394881920.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_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 5468 bytes
SHA-256: b8149ee38970e7d2bda521547d91184f890863639c385b5e16bcae5063c66223
font_01_sfnt_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 13912 bytes
SHA-256: 8710838e7c8e8d4739cee66172c86532ecbf61baee9b25786ea0b128ea8b7578

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