Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d99aeebb942285…

MALICIOUS

PDF

82.6 KB Created: 2021-02-20 19:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3022333ada76b87c9cfa9e6e5fef63c9 SHA-1: 5de509dbb060d23985279f475b2a500190a78898 SHA-256: a1d99aeebb942285a18ca802b7ca3d976ee0839cf36b3fba34b659c6a2c0c81c
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm and a ClamAV detection for a phishing trojan. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=ap+psych+exam+2020+study+guide PDF link annotation
    • http://xiwasaruv.66ghz.com/jeremivapalifugaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390097/normal_5ff448d0a5266.pdfIn PDF document text
    • http://agent-spv.space/5460738677ktkrp.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/zosugeju-mibufuwitoju-raposizuxaga.pdfIn PDF document text
    • https://lizoxezubim.weebly.com/uploads/1/3/0/7/130776499/duwuli.pdfIn PDF document text
    • http://brosbass.com/tower_crush_hack_versiono6o77.pdfIn PDF document text
    • http://probkin34.xyz/ultimate_galactic_conquest_modkglwy.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/zegewe_xelopevabitel_lubofifuji_dofifuv.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/3461131.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/jadudusujuje/52442558511.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/bmw_motorrad_navigator_vi_quick_start_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/australian_golf_handicap_calculator_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/1240960421.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/bisofejase.pdfIn PDF document text
    • http://jisukizopupez.rf.gd/arrowverse_crossover_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/29984047929.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/juvumeli.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_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 5792 bytes
SHA-256: 3c7fef549c5ad34a443a4321804d2e8a1c8ec63cc69989f5ad52955ba67cb3e7
font_01_sfnt_off000118d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D2 10760 bytes
SHA-256: 431d27adfc85335b6b09d447bca232f9cfb35cc9d69dbf6dc30b987a793d7e0d

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