Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabd49bb37b59597…

MALICIOUS

PDF

84.4 KB Created: 2021-04-02 18:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b4275c033a97991af8fe951c5af2797 SHA-1: 1c60e70a3deb3376159d87d59440a7e516ef9713 SHA-256: aabd49bb37b59597980cb9cfd35ddf2e17adef8f80449b3f371fe6c3b090d3f5
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'xajibur.ru', suggests it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF acts as a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xajibur.ru/123?utm_term=types+of+formal+letter+pdf
    • https://tofujifudaxibav.weebly.com/uploads/1/3/5/3/135326414/veligawod_biregomuxijakis_vugunok_mofiwekav.pdf
    • https://dibigisilob.weebly.com/uploads/1/3/1/6/131607467/filenekezorilis.pdf
    • https://static.s123-cdn-static.com/uploads/4451549/normal_5fce5333cd6bb.pdf
    • http://minosijasif.mypressonline.com/how_to_update_di2.pdf
    • http://jebifawulu.mywebcommunity.org/89149147641.pdf
    • https://cdn-cms.f-static.net/uploads/4375204/normal_5fdc24f029b2f.pdf
    • https://cdn-cms.f-static.net/uploads/4416299/normal_5fe838ee19e17.pdf
    • http://fonujameritules.getenjoyment.net/absorcion_de_los_carbohidratos.pdf
    • https://static.s123-cdn-static.com/uploads/4489409/normal_5ff82893df0f6.pdf
    • https://fidexodopisulo.weebly.com/uploads/1/3/4/8/134861067/8688565.pdf
    • http://volupixo.mygamesonline.org/negipovuzanix.pdf
    • https://cdn-cms.f-static.net/uploads/4472198/normal_603cf2802c9f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://padusij.onlinewebshop.net/47899795126.pdf
    • https://s3.amazonaws.com/jimugivos/mixed_parts_of_speech_worksheets.pdf
    • https://s3.amazonaws.com/bidurudilidujug/vegufen.pdf
    • http://vujapoguxesak.myartsonline.com/penuperolidugadesafusop.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c79.bin
09966e00fb7ecdd7f879394f073f1b89872edf7c5508ba7cd0af9bf05b116188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 5236 bytes
font_01_sfnt_off00011e3a.bin
6cd6fe7143a96544f5ec03775a5136df184154cd58c5474ce6486dcff18d62b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3A 11416 bytes

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