Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15988fb7a521eab…

MALICIOUS

PDF

69.4 KB Created: 2021-04-06 00:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cac0ef13facd932700902d20873a20c8 SHA-1: ca16614c40c0cf4a8970715bb3ff1c24af45bb41 SHA-256: a15988fb7a521eabfdcb56815b38979ce8dd689aebd8340a5384340560b30536
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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://kuzutuzo.ru/123?utm_term=contrat+d%2527+alternance+informatique+lyon PDF link annotation
    • http://lastmarkt.ru/cribbage_scoring_chartjfbp0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_6018b858bb7e2.pdfIn PDF document text
    • http://itdiscounts.info/apollo_twin_usb_or_thunderboltq3ehs.pdfIn PDF document text
    • http://coloradocustomelectric.com/file_academia_tanpa_loginvizvt.pdfIn PDF document text
    • https://mutosonagok.weebly.com/uploads/1/3/4/3/134316738/a26d91084e4ef58.pdfIn PDF document text
    • https://niromovikusuzu.weebly.com/uploads/1/3/4/6/134651616/tidifipovat_kizol.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/e4GidM8/comic_life_3_for_school.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/ajghJaN/witumebuximifuvixara.pdfIn PDF document text
    • http://3203epworthcres.com/583441143404c178.pdfIn PDF document text
    • https://bevikutemo.weebly.com/uploads/1/3/4/6/134648684/zinaxulumesene-rulaguvazumiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_6028a72999d22.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/mevuzokekenojab/kaulah_bidadari_surga.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/93846814633.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/jazzy_christmas_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/43348716848.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/jingle_bell_song_webmusic.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_off0000d0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 5156 bytes
SHA-256: 792ba7041f0e7f58e5a0231c80e6b7a1d0c538c33f198610eeeb9b1005197276
font_01_sfnt_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 12016 bytes
SHA-256: 090f6c7d87429f8805bb3d5e6855be52ca41bb638dc6d8113edcc309e2837d11

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