Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8b6105fbe4f535…

MALICIOUS

PDF

73.0 KB Created: 2021-03-01 12:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4c20e09c7b5fb42b70f7fd1c1cbc1cb1 SHA-1: f11f2d806c3feee41ebfb8fb5e9426bd8a91f652 SHA-256: bf8b6105fbe4f535a2cfca1826204ee0e6ff897b273e98d19e942843478273fe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest 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 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://mezovuduw.ru/wb?keyword=wings%20of%20fire%20book%2012%20and%2013 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411681/normal_602c43b0b85b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5fc57313b62f8.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/543247307.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/69369111388.pdfIn PDF document text
    • http://iuts.space/51489427121ks93w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500200/normal_5fd63882183c2.pdfIn PDF document text
    • http://abzac.me/44894040502f4lv0.pdfIn PDF document text
    • http://gbo.guru/absolute_c_6th_edition_download3w4cj.pdfIn PDF document text
    • http://sodowetan.mywebcommunity.org/kulozawe.pdfIn PDF document text
    • http://tehnoprom.org/54891640209e72la.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/kenmore_elite_microwave_model_721_light_bulb.pdfIn PDF document text
    • http://austritkfa.com/bofetodorulaxizebeludolu0b6dy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463812/normal_5fe31eaa2e5db.pdfIn PDF document text
    • http://hookup671.site/advanced_engineering_mathematics_10th_editioni6rey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nukilaba.myartsonline.com/how_to_use_mixer_kitchenaid.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/m_audio_fast_track_ultra_driver_windows_10.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/nujebevodupumajidin.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/how_to_get_a_psychology_degree_sims_4.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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 5608 bytes
SHA-256: 23139a166c52c537c6260ad098f421f28c005957766abd45e02f303145688319
font_01_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 10664 bytes
SHA-256: f1a54185c487b27fee9a11957a55c3c6c20f6ff1acbb26c5b32f43d3b8c661ac

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