Malicious PDF — malware analysis report

Static analysis result for SHA-256 7988445a14f63e5b…

MALICIOUS

PDF

75.1 KB Created: 2021-01-26 07:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0f3b3f848cc12a76d31dd93b6e2d6d1e SHA-1: 414b088c2e107b7ee965670d3d33c40d8fe76d54 SHA-256: 7988445a14f63e5bb974f0c90db1d1b6ef41d19120b7c6a2794f9894102fb8a8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=michel+foucault+history+of+sexuality+quotes PDF link annotation
    • http://brumbum6.xyz/diy_ideas_for_bedroom_storageriawz.pdfIn PDF document text
    • https://nokabukewodujam.weebly.com/uploads/1/3/0/9/130969525/xixumofezimopu-mudaziwig-xisefexu.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/ginaneparex_boxixitodo_berisivujorow_tivulugafi.pdfIn PDF document text
    • http://gazzsheff.xyz/video_making_app_for_pc_freezt48s.pdfIn PDF document text
    • https://sadaxolofomet.weebly.com/uploads/1/3/1/4/131453623/xagegep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5fe19a9fb953d.pdfIn PDF document text
    • http://italylife.pro/78097868549xvpoa.pdfIn PDF document text
    • https://fadirepux.weebly.com/uploads/1/3/1/4/131438814/741e06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_5fe3d628b7ca2.pdfIn PDF document text
    • https://vuvogotekepuma.weebly.com/uploads/1/3/0/7/130776629/rifag-fomibinoweb-wogobuv-xanek.pdfIn PDF document text
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/vaxotupalo.pdfIn PDF document text
    • http://christinaanddavid2019.com/seseta9m080.pdfIn PDF document text
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/a60d7591de8b8.pdfIn PDF document text
    • https://deluwibenarut.weebly.com/uploads/1/3/1/3/131382693/dizogonol.pdfIn PDF document text
    • http://ig-copyrightviolation.com/xilomajekundyy.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/tojabixefova/bivipexubazoduwixo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/best_football_live_scores_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/kakojujeb.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/raruniforebugubibolave.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/half_brick_games_for_android_free.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_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 5272 bytes
SHA-256: 9335b651221d78269666982ced0e12134c868bd06e1949ffb2ffd3ccb714baef
font_01_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10472 bytes
SHA-256: 8a13ee74da33fef03145dfd90f71426921128e6c1c20d8b378559e278c007431

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