Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2aee6e13d4d4dc…

MALICIOUS

PDF

98.6 KB Created: 2021-02-21 10:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e4ed67213260a848b79c24f35177ccd5 SHA-1: 7b51840b63ea2ce6c87b470db210afbc8cd4e31a SHA-256: 3e2aee6e13d4d4dceeff54f288fa7141f9b729e3b23659f3989fcbd3c4dc1164
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://maypoin.ru/aws?utm_term=inverse+trig+functions+not+on+unit+circle', suggest an attempt to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=inverse+trig+functions+not+on+unit+circle PDF link annotation
    • http://logoped-samara.ru/xezupisah8prv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416930/normal_5fc63d3b1baa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_6015b25ac36c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5fe25294034c5.pdfIn PDF document text
    • http://galoomer.online/romancing_mister_bridgerton_free_downloadrl86r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_602695a615603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_602d8016ea08b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_602088a9e9f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_5fe9854382aad.pdfIn PDF document text
    • http://propovar.ru/60774097204sjdu8.pdfIn PDF document text
    • http://spencermcman.us/94603303218z09eo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_6023d01aa2259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5fd3042d3e512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_601b1f10c8da7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447093/normal_60012dc75d1d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokepitu.rf.gd/android_studio_3._4_tutorial_espaol.pdfIn PDF document text
    • http://nuxizutize.rf.gd/kundli_software_for_pc_windows_8.pdfIn PDF document text
    • http://zavedofidime.rf.gd/87574295290.pdfIn PDF document text
    • http://tivekanudoz.rf.gd/relationship_between_research_and_news_reporting.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BC 4836 bytes
SHA-256: 3b0ec0077fcd069084cae29a665382a04aac0d94f201c8a6b966a2b3fe1788a2
font_01_sfnt_off00015553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15553 11684 bytes
SHA-256: a0b672e9a20163f884a9dc7559e4ed6b6e5fb7ae04d6c63bd79fdb12c8aa055c

Open this report in the interactive analyzer, or submit your own file for analysis.