Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f01be3200dcbe4…

MALICIOUS

PDF

74.2 KB Created: 2021-04-05 14:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2edb7ba621447af4ad990175363815f9 SHA-1: 2873342833ceb1b82c8f3f81f38765f013ae0552 SHA-256: 08f01be3200dcbe4280fca97541c1efd798ee2c6cdaa30c5e684defc54a8a638
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 hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, possibly for credential harvesting or malware distribution.

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://xajibur.ru/strik?utm_term=de+que+salen+las+piedras+en+el+ri%25C3%25B1on PDF link annotation
    • https://lowaribopuvege.weebly.com/uploads/1/3/2/8/132814272/tererimil.pdfIn PDF document text
    • https://cdn.sqhk.co/luketopaja/iibVBWS/20105086098.pdfIn PDF document text
    • https://cdn.sqhk.co/lapotalodige/iiY2aM2/wumirolemidotojasanesuge.pdfIn PDF document text
    • https://cdn.sqhk.co/xisofofumew/coCibGp/76853614467.pdfIn PDF document text
    • http://italdom.fun/typhoid_mary_anthony_bourdainkkxh8.pdfIn PDF document text
    • http://vnds-v.website/derodoxhoerq.pdfIn PDF document text
    • http://khareedforosh.com/jilos05t8l.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/OhhVijo/video_meme_maker_youtube.pdfIn PDF document text
    • https://dofonumid.weebly.com/uploads/1/3/5/3/135314870/ganupow-rusel-davuvekum.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuxilav/s1ggcjg/86192486739.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_10fbcae184b042c28b6f363d5a6fcf53.pdf?index=trueIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_32e1e4263ed940afb198124db6c7b40a.pdf?index=trueIn PDF document text
    • https://9d03b195-5c34-4993-8a23-519dd2bddccd.filesusr.com/ugd/9ac058_c3d57a47d1a14f6bbad5c9e79d675b28.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_8e5d9523ad7040b9ad87ab6ed2d2a6c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/955d30de-6b58-4205-ad7a-60526947f73a/64072625232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0765b0-cc26-4498-8494-d6aa9019081b/the_christian_atheist_study_guide.pdfIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_3e6f6ef33bfb40f4b940f2624f39bb59.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_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 5292 bytes
SHA-256: fb0ce504fd0bcbe144501062c1e4beae10651f9345fdddbe6159a205b15a8fc2
font_01_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 10956 bytes
SHA-256: e332983d8035e411d2ab16c75ad30c1f763cc348d8ea72c921198aeca7b7c3f7

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