Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a13e1596effb6ee…

MALICIOUS

PDF

76.8 KB Created: 2021-02-10 12:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4f845261d26cd4458c9c9f69b11c356b SHA-1: be717ae1a8416ed7f66d246bc06cbc1483f36ba2 SHA-256: 1a13e1596effb6eed4b3d8fb8d7e8d473062ac0495b167319f4a1de950ab7255
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure designed to redirect users to harmful sites.

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 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://bologen.ru/wb?keyword=business%20informatics%20salary%20us PDF link annotation
    • https://cdn.sqhk.co/ruvonusebex/cXCVqjf/gopul.pdfIn PDF document text
    • http://xrootunited.com/gunship_iii_us_navypnsa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494165/normal_5feb34cfcc5a3.pdfIn PDF document text
    • http://reduslimer.website/67313187001y5922.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/bCHkzgc/north_american_football_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/igkjbG1/68271785404.pdfIn PDF document text
    • http://jegotaraxipux.iblogger.org/8558353413.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426810/normal_600666c545337.pdfIn PDF document text
    • http://thelait.pro/foziwoyob1i.pdfIn PDF document text
    • http://sputnews.com/shooting_hero_gun_shooting_range_target_game_frees9l43.pdfIn PDF document text
    • http://civiliscmq.online/fexejadireajzob.pdfIn PDF document text
    • http://mandarin-fruit.space/gasetojezutinajedivazh8j3d.pdfIn PDF document text
    • http://dunotap.iblogger.org/auxiliary_transformer_operation.pdfIn PDF document text
    • http://future-techno.ru/nivesonenirasapogizhe3r.pdfIn PDF document text
    • http://fruitik.space/hibbeler_mechanics_of_materials_10th6idba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixuzisopufagok.rf.gd/quebecois_french_guide.pdfIn PDF document text
    • http://lafeseg.rf.gd/bang_bang_jessie_j_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_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 5180 bytes
SHA-256: 43ac33570900d71e41c2b5cbe307d67f586bd215fee840e93644516a3b5409fd
font_01_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 10964 bytes
SHA-256: 40cf943ab5a0e6135bb9c5b38d5d52d0fae9a151fb53ddd9c8327bb49def7872

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