Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fb81bda42cfa4a…

MALICIOUS

PDF

81.9 KB Created: 2021-03-20 10:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 23fc1590d9470019dc9c80454baf7b4a SHA-1: 5646be387ed379a5d8e0f69af457ef9c456384dc SHA-256: a6fb81bda42cfa4a77e3e818f348476af389f1f9e02470b9db8761ff9827fbfb
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://midufefew.ru/award?keyword=sociologia+de+la+religion+max+weber+pdf PDF link annotation
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/90a3e23a.pdfIn PDF document text
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/zaminab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_6038cbd21c2bf.pdfIn PDF document text
    • https://rebanurox.weebly.com/uploads/1/3/4/4/134490941/6166974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_60380417ba8a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413570/normal_5fef63481c558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_601a640039eb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_603105522f6a4.pdfIn PDF document text
    • https://rekaxuvukevo.weebly.com/uploads/1/3/4/9/134904446/8cd4bca95b.pdfIn PDF document text
    • https://pidufemimin.weebly.com/uploads/1/3/6/0/136054052/98f2f050.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/figidireki/descargar_apk_de_akinator_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f54ad6-9fa1-4cf6-b5d3-eb45abf98ae4/45254549345.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/xeremugusopixomomavogege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae9972d-c2aa-4c05-8cf7-ccebe569151d/maytag_mfi2568aes_ice_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce94e4dc-0a73-4e01-a3da-fb909cb54975/are_carpet_beetles_a_problem.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/answerphone_ella_eyre_lyrics_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8b8ad6-66af-4d41-b64a-099041ddf0d0/nugerodaxinurikubutuvogow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa39ad55-df1a-4e23-8641-bd6febaded8c/jojo_part_7_stands_list.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_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 5700 bytes
SHA-256: 832806e57b430663454e54f4d55026511a92b6438dc752d52c48a86901579623
font_01_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 11036 bytes
SHA-256: 9b64fca294094706078368d264af94393f9e49adf943b14a01168aff390e4382

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