Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9dc355aa9665916…

MALICIOUS

PDF

70.5 KB Created: 2021-03-30 00:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8fef96c1c67303fc8d502f785e355056 SHA-1: e09a2a59be0528d250447b1439ae22ab614b1fe0 SHA-256: f9dc355aa96659165d50f6a93e6525b8d4b29f8942105cbfe37cbcb782461d60
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/wix?keyword=san+jose+express+water+polo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409811/normal_601a76188c6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_60305b6ce87af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465392/normal_5feb8e1a37b02.pdfIn PDF document text
    • http://nesobaka9.xyz/zumevofidafi2vvcs.pdfIn PDF document text
    • http://my-favshoph.online/ada_programming_tutorialdkhfn.pdfIn PDF document text
    • http://big-ita.space/boston_pinball_price_guideh26no.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5ff28ec19b35c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5fc7e6454a2d2.pdfIn PDF document text
    • http://madamzero.com/leggett_and_platt_adjustable_bed_frame_50_series8dejy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472213/normal_5fede2d67ec18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_60184911b6cbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_605ca1dfebd9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_60307967a8aa5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_1512f67fa9174bb982246dcb74d9586a.pdf?index=trueIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_51f79dd971504addb23766fe8fefb3c2.pdf?index=trueIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_44148ac90a4d444ab9b653488944e3ab.pdf?index=trueIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_052b0766303a437592db44320ae609c7.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_6424c58d20a74e66ab43888c66a791b9.pdf?index=trueIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_64171ec643a3431b997dee3b582d0589.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e27913-4451-49e1-bc1d-895af8e2bbfa/samudopeluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c753d33-92de-48c8-bfaa-fd14df1df717/ralakebefalesajo.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_off0000d659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD659 5152 bytes
SHA-256: b5a2652ee0bc139a9432f22e995020763145426cfd69ac196991a866fa76f385
font_01_sfnt_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 10968 bytes
SHA-256: aa9443b7c0a30de1600a5908c6f18fbb9e8220637256910733092f292eab3dc8