Malicious PDF — malware analysis report

Static analysis result for SHA-256 405801bd48eecceb…

MALICIOUS

PDF

74.1 KB Created: 2021-03-03 00:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: acd3070ddb115557522d20ae70eb494b SHA-1: b0a9f9fa14cadfc3b720255d359796a708c121a6 SHA-256: 405801bd48eeccebd7082b52183aa264c89c56009fc00a5e0e9eab2f54446e99
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an external URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'Blood Bowl second season rulebook pdf'. No scripts were extracted, but the presence of multiple disposable hosts and link farm heuristics suggests an attempt to obscure the true malicious destination.

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 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://druttle.ru/strik?utm_term=blood+bowl+second+season+rulebook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487382/normal_5fcd11f399479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486354/normal_603e28d96ff59.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/CghgiVz/88133168246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_603598f279633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5fdb63e972b4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://benibabu.rf.gd/8935141877.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/ven_ven_seor_no_tardes_letra.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/56635483020.pdfIn PDF document text
    • http://pavebutom.epizy.com/auld_lang_syne_chords_piano_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/c_o_address_format_australia.pdfIn PDF document text
    • http://duvojawakupo.rf.gd/bisivofudigepur.pdfIn PDF document text
    • http://tupopozavagaf.rf.gd/xafasaduj.pdfIn PDF document text
    • http://karuserewojax.epizy.com/rdr2_all_endings_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/aashto_m_145_espaol.pdfIn PDF document text
    • http://joxumokuri.epizy.com/wasujidikomisuzumopaxaw.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/meketumomarotuvobegu.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_off0000e462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE462 5492 bytes
SHA-256: ef97be6e48f9502d466810968db4964208dcecf2e4e7e1f33839cb7cf1bb5fe2
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 10620 bytes
SHA-256: 746291d4de00e8a654c8d5677940b3f2f15e31241c9a54f2254eb5ec931445c2

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