Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0d8e40d75a5a4b…

MALICIOUS

PDF

69.3 KB Created: 2021-04-24 20:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08f44308300579962bb0b0e0348234a3 SHA-1: 7d052b678b95f130ab1a24a79e4f285bf1c39373 SHA-256: 6c0d8e40d75a5a4b801446703a945a0adb53c9a01f84294c9f51e3fec1f46000
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://crophysi.ru/strik?utm_term=marantz+tape+recorder+pmd
    • http://lizoguxumugef.mywebcommunity.org/lukiwagabefupepufazoj.pdf
    • https://cdn-cms.f-static.net/uploads/4504047/normal_6044d848d7505.pdf
    • https://cdn-cms.f-static.net/uploads/4371010/normal_605067b59504a.pdf
    • https://static.s123-cdn-static.com/uploads/4454426/normal_5fc8878967852.pdf
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5fd77914b214c.pdf
    • https://static.s123-cdn-static.com/uploads/4492278/normal_5ff709b77f121.pdf
    • https://cdn-cms.f-static.net/uploads/4470532/normal_60328125379ea.pdf
    • https://cdn-cms.f-static.net/uploads/4386622/normal_6011f7d7b894f.pdf
    • https://static.s123-cdn-static.com/uploads/4467287/normal_6009012e189bb.pdf
    • http://rakadan.sportsontheweb.net/vapugalelafuzumipori.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_1a745a23f7354f6d8e49feaa6601aed2.pdf?index=true
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_6956fb43585749ab9fbd7c5f97a38be0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a8ffe88-b825-4a41-a274-cf1a84604bd6/vurigomabajexosinuwuv.pdf
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_3b6edd3266464002b286241cbf81d341.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c2ce405-9a84-4ace-be0f-b918a49419cb/dyson_cinetic_big_ball_animal_pro_2_price.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_2f25ec6a91c84e4090c3bacdb8d2aac3.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_b432b59baf82402bbea50531ffc0f62a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e10dc84-fe29-446e-9c3c-10d197fb4e77/28210773023.pdf
    • https://uploads.strikinglycdn.com/files/979d7a57-f689-4ba9-a8c3-ed3f38be1dfd/annabel_lee_analysis_poem.pdf
    • http://mavuriwowul.myartsonline.com/personal_assistant_job_description.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c888.bin
a8615239ac58dc226c44a21f76e73bed2f00caa3c1d477a1f9ff65af2ffe9284		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 3588 bytes
font_01_sfnt_off0000d57a.bin
c6419944c7baf47bff1db4a507b166f970f0d8a51067f3f9c08d817c87e4fcb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD57A 5064 bytes
font_02_sfnt_off0000e6ac.bin
ab63deb5a242cd8a9696089f6f9c02831932b44f5bf7551cd8361c7f8954b27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 9704 bytes

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