Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8ca8c3c71f1e86…

MALICIOUS

PDF

86.4 KB Created: 2021-02-22 18:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c84d58ad5e4a6fc33c1a1e3efd1ab0d9 SHA-1: efc0f3ba7c061f929eb65e4daa9546bd7982839b SHA-256: 0d8ca8c3c71f1e86dd2ab7f0c7baa069d64b6ab1976a664b3bbe0fde132cecb4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The document body, though heavily obfuscated, appears to reference a 'verbal reasoning practice test', a common lure for malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=verbal+reasoning+practice+test+pdf+253+kb+answers PDF link annotation
    • http://repair-planshetov.ru/download_clash_of_clans_hack_new_updateqk2qf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426424/normal_5fe518c909ae6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423133/normal_600082f577de4.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/2947409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fff4d0173763.pdfIn PDF document text
    • http://afracheat5.xyz/rmlau_syllabus_2018lrf7c.pdfIn PDF document text
    • http://dfwshootersupply.com/34115627475nkj5r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469143/normal_60336dda899d7.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/ighflhQ/radiation_city_free_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/ghcijhh/zevatuzowateruwimamu.pdfIn PDF document text
    • http://igclienteam.com/c3_and_c4_plants_examplesnb1b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_600fdd74afd0e.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/sXMfzij/55528696116.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/solonebosop/synonyms_of_answer_briefly.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 6004 bytes
SHA-256: 2f66c136cc074b42810b3cab6ad0a77ea99203ef78b0996fc123a30c5f50c957
font_01_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 11292 bytes
SHA-256: 7bec34a0b533fc7b4b502b5b636fa35f7736d448fb0948c33076975545f913ab
font_02_sfnt_off0001357a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357A 16452 bytes
SHA-256: 10b2a10e3b82876193ba22d24124875710dc7f38e48dfd94ebc74a281f150509

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