Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4836af04283ec9e…

MALICIOUS

PDF

81.4 KB Created: 2021-03-08 18:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 364411bdb1d7252ac438812d385a409d SHA-1: 35eee744cec90079ae2fe433cdf3e2b5baed76f2 SHA-256: d4836af04283ec9ee0b9274beef1793ec857fee9be3fa82a350b77fed4c5fbb6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of an SEO link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://seumenha.ru/strik?utm_term=what+is+the+density+of+heavy+fuel+oil PDF link annotation
    • https://cdn.sqhk.co/jatizaru/ji6ScoY/dalagixajibuvipabugexokof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6036904d95c8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fce6b15080c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470535/normal_5fd78e677a999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_60187f54e1772.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/2vJxeib/dora_saves_the_crystal_kingdom_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/dawiredi/Fqij1hi/24409349222.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/jMjewhd/miwinuzekikove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_602aff673809a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_60251913ac80a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5fed2d3532e96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_5fd1eb86af689.pdfIn PDF document text
    • https://rasofenetiko.weebly.com/uploads/1/3/4/8/134862321/vutug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/223a06a3-46b6-4cfe-bf51-eb6097828478/gopro_seeker_backpack_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b892647-de82-4949-ae67-46554b2fcb40/crochet_mens_sweater_vest_pattern.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/3429084862.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/the_100_book_2_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f028d5cb-9f53-4762-aee2-d07b927ba2a1/how_to_charge_g_shock_solar_watches.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/26525966564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c8c873-1518-4a8e-a2b1-f13e8fdf1dcd/power_cooker_pressure_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/iit_delhi_gate_2020_syllabus.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_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 5076 bytes
SHA-256: 762c3b8cfa4d7d6aa5eb89c2b35dffda41b23f24aafb0d3688f8cacd81df9a28
font_01_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 11744 bytes
SHA-256: 4a6f3ecf696645efb07d4391f0923a796a7d6454bddbeea7cc1a0ddf87a35845

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