Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a3aa29efb53fdf…

MALICIOUS

PDF

72.9 KB Created: 2021-02-10 21:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 34ba80ef3951b30bdfd825fa3df88a53 SHA-1: 9ba319d29c8cbd9906cdfea8ea7f75859fe1aee4 SHA-256: 65a3aa29efb53fdf97f436920a2eb3a3ffe94e77890404d5a8c045d7af1d68b2
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://jacksth.ru/aws?utm_term=wedding+card+templates+free+printable PDF link annotation
    • https://zedifetizigofup.weebly.com/uploads/1/3/5/3/135393349/xiruvurevoxasajimigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_5fdba47911d01.pdfIn PDF document text
    • http://kreativoblako.com/facebook_blueprint_coursenwiyf.pdfIn PDF document text
    • https://vozoduxi.weebly.com/uploads/1/3/2/8/132815828/8235224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417414/normal_5ff7d5dc90946.pdfIn PDF document text
    • https://pofitefe.weebly.com/uploads/1/3/4/6/134617546/2553289.pdfIn PDF document text
    • https://judozonax.weebly.com/uploads/1/3/1/4/131454501/betemaripexiziv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381762/normal_6003f211698f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_60129c2dd30f1.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/zijivevip/gozupep.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/riguma.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/ratubupidofajor.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/awake_2019_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/grammar_games_and_activities_for_teachers.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/50986912891.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/23962734924.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/aerobic_exercise_weight_loss_video.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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 5628 bytes
SHA-256: 332ec411c43dc87dfb665703f037660296d20ade4303849e14e0bb695324c79c
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 11052 bytes
SHA-256: 2952a292d33bdefa0b0bbd49ad0069e23fbfc29d21e029aabea51fe044f1c489

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