Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c953d87dcfe95b…

MALICIOUS

PDF

85.6 KB Created: 2021-02-17 18:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 068b8af37c7dee49c1f6bf41954785d1 SHA-1: d1e0e52d6cd6c7a4bfdf89c29ef17d799e1a0120 SHA-256: 99c953d87dcfe95bdb83a6b6355abd09e9d9702404472a53d1ff7e7e9d50304e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a spearphishing attachment delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/123?utm_term=forgotten+realms+deities+by+domain PDF link annotation
    • https://cdn.sqhk.co/movumatoz/hijfhcG/science_lab_equipment_list_for_school_in_marathi.pdfIn PDF document text
    • http://nuverlites.online/vawidebakugalad8sr0k.pdfIn PDF document text
    • https://dovenokitumenu.weebly.com/uploads/1/3/1/4/131482991/d3ab5.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/Xnjaidu/pagokoleve.pdfIn PDF document text
    • http://dimax-matrasy.ru/jawuvetezorujqe635.pdfIn PDF document text
    • http://wemuwugisenoro.iblogger.org/10675887695.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/OjgoWsY/80940342325.pdfIn PDF document text
    • http://milesnires.xyz/mr_pumpkin_2_walls_of_kowloon13zap.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/XQjgjgd/analisis_foda_de_escuela_secundaria.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/lezawobusedo.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/fosup0f/mod_gta_san_andreas_android_cleo.pdfIn PDF document text
    • https://wijugiretatito.weebly.com/uploads/1/3/2/8/132814958/sadugowekiwonoke.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/iwJFhhF/roblox_castle_story_secret.pdfIn PDF document text
    • https://sudarixadozitot.weebly.com/uploads/1/3/5/3/135331315/4d5ded07d414720.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jizuperuxe.epizy.com/86438008299.pdfIn PDF document text
    • http://tiworetaganufo.epizy.com/kezeniwepunavabilos.pdfIn PDF document text
    • http://zadiriza.rf.gd/kekanagajemerozujo.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_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 5340 bytes
SHA-256: 12c825908363cd393a9949fca483a23e19b2f5e849574ad05e744cfacf2654ca
font_01_sfnt_off0001258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 10724 bytes
SHA-256: 33f78a54a215a9b28493eff808b4bc61cd62e263e98c9161393b3e3e85739b0d

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