Malicious PDF — malware analysis report

Static analysis result for SHA-256 051344ee2ad581f8…

MALICIOUS

PDF

86.8 KB Created: 2021-02-10 07:38:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c8e3d2468f96fa78cc0de820fa6882a0 SHA-1: 290100e4aead56e0d675c1ec6ba1e8fbfd7b9d97 SHA-256: 051344ee2ad581f88732bca1155c788c883256047418f24a26e85bbfbea06c21
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, aligning with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://leonvi.ru/aws?utm_term=mystery+of+love+piano+sheet+music+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422168/normal_601878bc2fe26.pdfIn PDF document text
    • https://fuviwezajoz.weebly.com/uploads/1/3/1/3/131379384/8293361.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410000/normal_5fe3c29e8e048.pdfIn PDF document text
    • http://rizusapi.22web.org/youwave_android_emulator_system_requirements.pdfIn PDF document text
    • http://wawewifebobojum.22web.org/jabofukidoposemevipu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410714/normal_5ff2e0a65d77a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425908/normal_5fd1635a8364b.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/8447487.pdfIn PDF document text
    • https://jaxowukijov.weebly.com/uploads/1/3/0/9/130969500/juzokajozitipe_betam.pdfIn PDF document text
    • http://xudisoda.66ghz.com/telangana_election_results_2014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_601663c09dec9.pdfIn PDF document text
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/tomedej-dubusinufir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5fdbf7c5dfe57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tepuxasimu.rf.gd/34281623388.pdfIn PDF document text
    • http://motiwop.rf.gd/dajosowazuragozujakuzidel.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_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 5420 bytes
SHA-256: 275a777c16d07550d4cca6f563ecb02c3788d5cbc703fb0969f1c9233e52ab33
font_01_sfnt_off00011282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 11200 bytes
SHA-256: e3b78030428d92ec862dfafe354253975528eb5c3f4ef57b581185143b18c91b
font_02_sfnt_off000138fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FB 16100 bytes
SHA-256: d973db94ba2c448c661c26f08d051ac794e7cb4f3c7daa33c2141e8036f071b6

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