Malicious PDF — malware analysis report

Static analysis result for SHA-256 a775ac06eadf8302…

MALICIOUS

PDF

77.5 KB Created: 2021-02-27 17:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cffebdffc87ba1ed53e72dc75682251d SHA-1: 7f79da548bf79649fa7c9cb194a7d166786caf9e SHA-256: a775ac06eadf83027aa70ea31d17ea1f86b2e9cae5bccd60d25685f9ca13861f
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The PDF structure and the presence of external URIs suggest an attempt to phish users or deliver a secondary payload.

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://seumenha.ru/strik?utm_term=25+hp+johnson+outboard+carburetor+diagram PDF link annotation
    • http://lelekelosutov.getenjoyment.net/tekezufejegiridojo.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/61805263375.pdfIn PDF document text
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/medosalano.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/tilemexuxevun.pdfIn PDF document text
    • http://katipef.medianewsonline.com/signs_and_symptoms_of_post_op_complications.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/jilenuze.pdfIn PDF document text
    • http://fufirajonitav.22web.org/20397739056.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/63021708957.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/zuwurazoku.pdfIn PDF document text
    • https://vidamizumowi.weebly.com/uploads/1/3/4/5/134598026/xejedofore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujurow.rf.gd/71016720330.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/kidde_i12060_home_depot.pdfIn PDF document text
    • http://mujujum.epizy.com/canon_mx922_printer_head_error.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/butitigumupa.pdfIn PDF document text
    • http://sivojosifa.epizy.com/complaint_letter_template_microsoft_word.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/foxil.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_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 5832 bytes
SHA-256: 4b0f674f6841c0f0c33e42837013b3af5e79725b9a9c10f1e72fd4a0d98eb77b
font_01_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 11424 bytes
SHA-256: 18dd16bdedccb699a2b42a2c50f20ae4ad125d9b4fb55a29284a8eeb56618369

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