Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05d6ccf6b530f1a…

MALICIOUS

PDF

71.8 KB Created: 2021-03-29 20:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 82eb121fa663117a058e64bf310f2f34 SHA-1: 5d00590ae6b673f1191d1c36397890bb5c6ef24d SHA-256: d05d6ccf6b530f1a7afb08056eb8e028cdb783143ad8bc8d2b7d09a6fe5c7bb3
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded links. One critical heuristic indicates the presence of a PDF link farm pointing to potentially malicious redirector infrastructure, specifically citing 'https://dafemum.ru/wix?keyword=wtx+clamp+edge+guide'. Another heuristic highlights a link farm on disposable hosting, with 'http://vegofejolafud.mygamesonline.org/how_to_draw_for_beginners_step_by_step.pdf' being a representative example. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the extensive link farm strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=wtx+clamp+edge+guide In PDF document text
    • http://vegofejolafud.mygamesonline.org/how_to_draw_for_beginners_step_by_step.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5ff758ada45c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480590/normal_5ff47640e2b9c.pdfIn PDF document text
    • http://punejew.mygamesonline.org/lier_2_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/jgcihS2/gajoxozasafurinaj.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/d4hfhgG/pasamilebiwigusijal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_601474ef1b2d3.pdfIn PDF document text
    • http://dobofozepop.mygamesonline.org/fubojekedeboru.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/35772313540.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_17333031948f4fce8cb8e24819e40c6e.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_559925e62aa14b0aa7b7e2240cdf050b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotenu/44199748662.pdfIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_cdf1f5158df6409090dad66506ce03c6.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_0d7194d1596f463795a63ab17281f504.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jebokizez/14098574930.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/the_fisherman_and_his_wife_helbling.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/runofujukumoxo.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_e4d4ff2472f1409e99326929fd42ba34.pdf?index=trueIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_8fe08a833581425c8039f75003ffa57c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/cheesecake_factory_red_velvet_cheesecake_nutrition_information.pdfIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_1a0a00ca2e8347418925570417fe587f.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_b70de08bb4b8492493042fd704e86775.pdf?index=trueIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_d409e8556935446f868b1eee50e3a838.pdf?index=trueIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_efe8da1fdb084d76b6a33c861905e6b1.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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 5200 bytes
SHA-256: adc4114cef2e82ea4ef8121fbdcd411f0ace3884d6ec3bfef95427cfcd348a71
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 11232 bytes
SHA-256: 6deb530881c07e91e3ea0039c7ef5fa34869e80f947baebf73fcd1c535563a50