Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c8136d7c8978e8…

MALICIOUS

PDF

80.9 KB Created: 2021-02-23 02:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 55442340ef449de1cd12e4b151ab75ca SHA-1: 3bbadabf3e3b90f87a1e982b46f0347d5266dbad SHA-256: 29c8136d7c8978e82c7ac542b1131933cd49e52f168d717994d3e15ab0662089
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various PDF files hosted on disposable domains. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics confirm this behavior, suggesting the document is designed to redirect users to potentially harmful content.

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://maypoin.ru/aws?utm_term=interior+design+class+nyc PDF link annotation
    • https://cdn.sqhk.co/waxobakal/jjbijhb/prank_sound_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/suvezadamut/gcQAhg7/world_war_zombies_maps.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/ctchhii/battery_charger_autozone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_5fd15cb8a5f26.pdfIn PDF document text
    • http://varistop.site/urdu_books_whatsapp_group_linkz8hkr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414696/normal_5fe916f29ff1b.pdfIn PDF document text
    • http://comforfemj.fun/diy_lithium_batteriesh04do.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_600cc5b2d94d5.pdfIn PDF document text
    • https://naxesitigas.weebly.com/uploads/1/3/0/7/130740165/marulodor.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/dITjiWl/tijavaregofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_60297676b126b.pdfIn PDF document text
    • https://cdn.sqhk.co/namaboniki/nhdhcLn/86975222769.pdfIn PDF document text
    • https://cdn.sqhk.co/nibijegun/ibgiYgc/58211802547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5fe1266f9075e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_6031abbfa6954.pdfIn PDF document text
    • http://55571.ru/dofesimopilikuxuzi8wn9y.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/nhjBjaI/mixed_strategy_math_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_6011db0b9bfa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417824/normal_6017272bac265.pdfIn PDF document text
    • http://velesvoyage.ru/89380903857sj6z1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 5148 bytes
SHA-256: 0b005f811cfd33d1d378f16fd52114c294f4fc99ff097d2e98ae3a01320c0c94
font_01_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 11164 bytes
SHA-256: bb7e9f16290139bf1acb1dd269b20f717dc64aea90748127880cc7cd8266e2e7

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