Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9c2a58a136f0bd…

MALICIOUS

PDF

80.7 KB Created: 2021-03-22 20:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 452b5c58dd5a4c0f3c670f6b7086ef89 SHA-1: b8e208f69fcd6ab3114da0cb4d358861c5f65346 SHA-256: dc9c2a58a136f0bd04d17b41b9e5a47c1f583bdec74aa3f3f07ebb6e75e68b6d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://soxebez.ru/aws?utm_term=what+are+other+words+for+slow PDF link annotation
    • http://dimax.website/how_to_open_back_of_lg_flip_phoneoq7rk.pdfIn PDF document text
    • https://cdn.sqhk.co/zitibidino/ibHOwgh/62844490591.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/pAij1nS/zombie_war_dead_world_2.pdfIn PDF document text
    • https://cdn.sqhk.co/wamedexipun/DgcnhhF/the_roommate_cast_2018.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/76195735775.pdfIn PDF document text
    • http://look-hotel.com/fatevosopowozebuluvuxom4g788.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/3Yhjhf5/dj_papi_jumper.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/diaiifc/skip_bo_junior_rules.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/habanera_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxarabo/bgcpidW/vuragimibonexalefa.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/a5oifA1/battle_warship_naval_empire_gift_codes_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/xYhhdkN/77880498088.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/application_form_for_canadian_visa_lottery.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_faa9c4bbe4c144569570ea82adfa3f24.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_b3e8b612b9524c3daf4c7869a66eda50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/tewukijefewisasofiraduk.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/56134486290.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_ed72930c36ce42d288ed29205d70be00.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_d3b381322fe64932b45797d8fbb4c0cf.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_162fa8cd28ce4951b0af96323dffee5f.pdf?index=trueIn 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_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 5100 bytes
SHA-256: 2094c89d3991152d14fbfdfdc568fc3c3afb93ea90a97db59d8c1e848e83e4b0
font_01_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 11292 bytes
SHA-256: 6723fc6acb213a0a38e207fa066811c3d4eb284fabad7630af5327cc3f96ceed

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