Malicious PDF — malware analysis report

Static analysis result for SHA-256 081357fbf49ed753…

MALICIOUS

PDF

88.9 KB Created: 2021-03-23 05:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a1f7f77bbcc8b51dc183e455dd9db69 SHA-1: 2a8d6d59bcb08155390ae6e74f4c5e771f3abf89 SHA-256: 081357fbf49ed753a6d78cfebb586602d7d6ffd8ee15f2f49cff6de9656ea77d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The primary malicious URL identified is https://ponafet.ru/strik, which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=data+science+course+syllabus+quora
    • https://xamatetafuxu.weebly.com/uploads/1/3/1/6/131606968/024b91e2d00b89.pdf
    • https://cdn-cms.f-static.net/uploads/4405946/normal_604cfd42ad598.pdf
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/kokexa_bobawemiwolu_negipo.pdf
    • https://zoxuxidez.weebly.com/uploads/1/3/0/7/130775284/40d411b4.pdf
    • https://cdn-cms.f-static.net/uploads/4388824/normal_602b85eedb478.pdf
    • https://fajasorefasox.weebly.com/uploads/1/3/4/3/134348900/b98362.pdf
    • https://jopakawinotu.weebly.com/uploads/1/3/1/4/131407654/5974028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1c3ecebe-5f5e-4ff5-aa11-68f48b3433a3/5569473292.pdf
    • https://uploads.strikinglycdn.com/files/b68cd251-691f-4333-b9e1-a103bbb7040e/basketball_plays_for_3rd_grade.pdf
    • https://uploads.strikinglycdn.com/files/e16b71d9-4642-4c2a-a139-a1a756ee4e08/high_heel_platform_boots_uk.pdf
    • https://uploads.strikinglycdn.com/files/49e53a9c-ff24-4c16-834b-c4517512330f/povate.pdf
    • http://pinamagowejut.epizy.com/11599111342.pdf
    • http://gelanuvefod.epizy.com/a_m_a_ka_full_form.pdf
    • http://winibosekuzel.epizy.com/hunter_thompson_hells_angels.pdf
    • http://texaliborobiko.epizy.com/gazowabezigoduwirog.pdf
    • https://uploads.strikinglycdn.com/files/9107b0d3-bd73-4a53-9399-bb2b818394de/bibawogudilodabo.pdf
    • https://uploads.strikinglycdn.com/files/191447b4-56ff-4d41-a252-2526206185bf/30006792669.pdf
    • http://folevibowabo.rf.gd/how_to_measure_mikuni_carburetor_size.pdf
    • https://uploads.strikinglycdn.com/files/b83e36f4-4792-4c3c-82f7-bbe6ba6c6c38/siragoxibipipuxajevuda.pdf
    • http://dijemawijopetu.epizy.com/eclipse_oxygen_for_ubuntu.pdf
    • http://sexepafo.epizy.com/circular_saw_rip_guide_home_depot.pdf
    • https://uploads.strikinglycdn.com/files/d6364525-0615-4fb9-89a5-369cdb161f6c/dd_gods_of_war.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_off0001112d.bin
59a6f75c2c7de953596ece2f1c106725f87474d36d6b6893dc2502728a21f83b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 5040 bytes
font_01_sfnt_off00012263.bin
7643fd9c99f611b866f3a01a529f4cd1357728c8c0b19e33faebaafa8899cb15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 10920 bytes
font_02_sfnt_off0001478a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1478A 4324 bytes

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