Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d18379b30a87e1…

MALICIOUS

PDF

75.0 KB Created: 2021-03-16 16:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d6525121d9feec92fa75736e0dafb3f3 SHA-1: 930b8581a58380d4ef453296de7f1fc87ce1631f SHA-256: 55d18379b30a87e183199d91d3ead4d3c9ee202bdc93c67858f294be6afb9096
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/strik?utm_term=movies+like+knife+in+the+water PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5fd646e9ac455.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/jdijd0g/bowling_canterbury_play_islands.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/siggg7s/final_fantasy_tactics_switch_jobs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423145/normal_6024bee4f35be.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/4hfbYJq/93861362503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420905/normal_60179bc8a0f30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fce6c89c844c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugikalijuboxo.epizy.com/71238350322.pdfIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_7616a9257ccb4ca09d47e921f4e63d12.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_846695e72b1d4f65b7bfb84f08aaf7a6.pdf?index=trueIn PDF document text
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_f33d1adbe36b495aa947041ab8112c64.pdf?index=trueIn PDF document text
    • http://tepaduvofevog.rf.gd/software_company_portfolio.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_f09087cedca142c3a804dbd1061ddffe.pdf?index=trueIn PDF document text
    • http://berifukozek.rf.gd/zisite.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_5f902598d0d34341864437ebdebef0dc.pdf?index=trueIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_1ebf19d9845d49688bf65303d28dc556.pdf?index=trueIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_b7b0eec682ea486aa4ef72303eecd734.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 5076 bytes
SHA-256: f5802d2b5fff920b0b03dd40401c3773208b46f0f9433ee5ac7a2ac014836347
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 12016 bytes
SHA-256: a224c9e752e7357348881ac6f5cb76f9f559ba25af3f2de6cce6d1cd0dfa5b11

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