Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9854285c00fa3d6…

MALICIOUS

PDF

79.1 KB Created: 2021-06-01 06:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8aebf3512b9a8650667afca91a42976b SHA-1: c511a42bc682851d5993195b4b08f954acd7bcfc SHA-256: a9854285c00fa3d6d80acbf8b51d2169118f5d82607811cdff338a6f841846b3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://crysiq.ru/pbw?utm_term=what+book+series+is+similar+to+diary+of+a+wimpy+kid PDF link annotation
    • https://wamokanudetavud.weebly.com/uploads/1/3/4/5/134510572/8411150.pdfIn PDF document text
    • https://jotabaputeja.weebly.com/uploads/1/3/5/3/135350690/4228075.pdfIn PDF document text
    • https://munojafejim.weebly.com/uploads/1/3/0/8/130874523/a4c468c15.pdfIn PDF document text
    • https://sawamamuwez.weebly.com/uploads/1/3/5/9/135992332/2571707a3e3e1f9.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/8837871.pdfIn PDF document text
    • https://sirefofaf.weebly.com/uploads/1/3/4/5/134523631/suwuxare_nunuvuzi_xopuranaxajez_dapevuvowejemef.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/legidepatarowifor.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/9519125.pdfIn PDF document text
    • https://sowalofawu.weebly.com/uploads/1/3/4/4/134441006/4900bea.pdfIn PDF document text
    • https://bosevexoliwi.weebly.com/uploads/1/3/4/5/134585498/vixibusuxerexipoxi.pdfIn PDF document text
    • https://xabifiwalutoku.weebly.com/uploads/1/3/6/0/136085939/e7e0ce38d8b7.pdfIn PDF document text
    • https://kekebamifibem.weebly.com/uploads/1/3/1/6/131606854/wuxiwubotitemo_bojakexuwe.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/xuwaso-zunurujepu.pdfIn PDF document text
    • https://falobulavogibe.weebly.com/uploads/1/3/4/6/134662271/fifizubabubexedop.pdfIn PDF document text
    • https://sibanixo.weebly.com/uploads/1/3/1/3/131380297/0905c53efc2c34c.pdfIn PDF document text
    • https://valiveve.weebly.com/uploads/1/3/4/7/134730204/wosebu_xukujajovomamug_vapemefogu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gifavipa.pbworks.com/f/turning_radius_calculation_for_cars.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144423480/macbeth_act_4_scene_3_stylistic_devices.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 5376 bytes
SHA-256: 251aedb48e07aa1ac28ee4eaec154bf53c8ec27e6de67f663aecfe1a4e3e0a29
font_01_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 10240 bytes
SHA-256: 7385df27a7bb59dd96d83fa7357099d7f89264bdd3a0a1a3692588b3d87b72b3
font_02_sfnt_off0001216a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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