Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1186ced2ec7b20e…

MALICIOUS

PDF

76.0 KB Created: 2021-05-16 21:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: de4fbbf9a790a3e620ea7fe9f7b7bbd4 SHA-1: 45b9bd0d1dc246a399e2008376fe6832eacd7e4b SHA-256: d1186ced2ec7b20e6f4e20033ae7a079bdcccd414d0e8f27624f65711fd13e5e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and likely intended for SEO manipulation or to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous external URIs and the link farm heuristic strongly suggest a malicious intent to direct users to potentially harmful sites.

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://bologen.ru/strik?utm_term=law+books+pdf PDF link annotation
    • http://mscredit.info/8593759391es0j9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415525/normal_5fe17a47a9ec9.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxeneson/hhCgevZ/hocus_pocus_cast_2020_vote.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/71970491240o7ur.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/dehg3hj/appsc_previous_question_papers.pdfIn PDF document text
    • https://sasenepekevob.weebly.com/uploads/1/3/4/2/134266747/kobozawobet.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/hjzhbTW/5120517602.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/hafgigi/wagigifitijowusufiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5ff14242aacd7.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/nCjgjgk/rising_stars_basketball_game_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_60640f35cc96e.pdfIn PDF document text
    • https://zimekepipo.weebly.com/uploads/1/3/5/3/135351260/rewefageb.pdfIn PDF document text
    • http://eroganoficial.site/42775828055veyoa.pdfIn PDF document text
    • https://cdn.sqhk.co/zokoxirinuz/gghcgdj/chargepoint_stock_price_today.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/esgd1Vt/scalextric_arc_pro_platinum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_89bc0a7bb81241c3bbee705cd7c2643b.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_66388cf7ec1a42439ddadf522acd9c1a.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_79bb46837532450194a67dff19cf12d7.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_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 5144 bytes
SHA-256: 6a8dbef21109e47921f0d5eea41d38dd6d6b7f4e1837318f91f7ba2557f44162
font_01_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 10964 bytes
SHA-256: bf97aad5d3dea89c3c34a1ed2b2365195722728c6487766ea3612c3938241557

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