Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea33e04a3f29ba3c…

MALICIOUS

PDF

75.2 KB Created: 2021-03-17 06:30:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d43952147e775c31c3847b9c2d37d078 SHA-1: 9fbbc530018bc9bb309355c6247bbfcb257b28cf SHA-256: ea33e04a3f29ba3c36be9b8bd86c5e37002295f350a5cc671798f724a502e130
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are generated SEO-style links pointing to other PDFs. The ML classifier and ClamAV strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded URLs suggest a link farm or phishing campaign designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=apparato+digerente+pdf
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/kedukegajovu-bodefolo.pdf
    • https://cdn-cms.f-static.net/uploads/4387031/normal_6019f259694e5.pdf
    • https://gebedosoxabitox.weebly.com/uploads/1/3/5/3/135324181/9596869.pdf
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5ff14b7e74c56.pdf
    • http://vogudikomi.getenjoyment.net/2494350071.pdf
    • https://cdn.sqhk.co/wunokebewoz/JUhhyQ3/lubepokoferuwoguwumoku.pdf
    • https://cdn.sqhk.co/sovokeduseb/Thciahd/22575699561.pdf
    • https://cdn.sqhk.co/togixulala/SBvygfa/74585300915.pdf
    • http://deliwubavamir.mypressonline.com/anaesthesia_for_aneurysm_clipping.pdf
    • https://cdn.sqhk.co/mivuxakadu/zjbNkAD/insights_for_android.pdf
    • https://cdn.sqhk.co/vameduvide/eK8gchj/doctor_robot_emergency_animal_rescue_robot_game.pdf
    • https://dawejufajipamoz.weebly.com/uploads/1/3/5/3/135350304/1a397896.pdf
    • http://jezonikiroka.mygamesonline.org/100_examples_of_word_analogy.pdf
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/8460833.pdf
    • https://cdn.sqhk.co/nobipajami/jahbjeL/30887969413.pdf
    • https://cdn.sqhk.co/mekurapiw/gf3lher/4507698681.pdf
    • https://cdn.sqhk.co/vinogusi/YTiiuie/goduzefak.pdf
    • https://wexasubofuxumeb.weebly.com/uploads/1/3/2/7/132740188/561233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e881.bin
2d93b08467afb7c0352b9f00bfee21f38af4696517bab124a4a5c0aea678e369
pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 4988 bytes
font_01_sfnt_off0000f990.bin
6df7187994e24149380f622b80dedb41dd6b104926a0b4016db4d4a04e953e31
pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 11788 bytes