Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ede09bdf626af5…

MALICIOUS

PDF

138.5 KB Created: 2021-03-30 21:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 64da9e805ed818caa1e97d020b8949fa SHA-1: 5ca4e93ecb7cfd24970c4fd6330a1265bd72afb9 SHA-256: c7ede09bdf626af51d9a2449a178fcf1dd314e21294e7136451cac99b51d505e
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fokemale.ru/123?utm_term=bleach+bount+arc+episode+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5fcc98c344a2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_5fd60084b8d4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_60594b0aa799b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_6054920fb04fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_6043ec75579d7.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/gcjf6ih/88872092493.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483071/normal_5ff48a01346fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422372/normal_5ffe993038def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_603f1da3232fb.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/hahdZDY/mobile_patrol_inmate_lookup_missouri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456663/normal_60584f9b55b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_604de121610b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_74886763ea4c485b87a43f2889770356.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/695aafc3-d436-4218-8990-c85ead80b5c6/equations_with_variables_on_both_sides_worksheet_answers.pdfIn PDF document text
    • https://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_af0db63e3b28420fad9bf1372fb4bd57.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_0ad49afe5b664629827df472e091bf3b.pdf?index=trueIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_dc518cff691d46ff88de5f865805e613.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_f3f01c56f7f24f15be48f3dc38529b6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4490be88-8af1-46f1-a9e6-aa2389bb6e49/where_to_buy_lock_pick_set_near_me.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ba7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA7C 7568 bytes
SHA-256: 17592e195ff7302d3b087e3e4f5db7819c04b319eeb7e78b5c18b384561b4f13
font_01_sfnt_off0001d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D452 5404 bytes
SHA-256: b61a7afd881fb8865f03628be73c6f78684c59efea475b5d08cc0a7deca4f88a
font_02_sfnt_off0001e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E696 11884 bytes
SHA-256: 056c4efee44c02503abc82163df1e5e2d9aec3e9c741a8636536616d0d3cfbd9
font_03_sfnt_off00020de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DE6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3