Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45cdec5a013333c…

MALICIOUS

PDF

81.3 KB Created: 2021-03-30 18:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8eb3eed8195fec39987ad31f5ade4827 SHA-1: d411222a45ab1a3e1aa3017d2e99ef7f65f2e751 SHA-256: c45cdec5a013333c8c1b35bf1fc75f46863e0cae4e6758886c34e3fca86d0980
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('botokaw.ru') that is likely used to host a malicious payload or phishing page. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a phishing or malware distribution intent. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a malicious intent to redirect the user.

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://botokaw.ru/strik?utm_term=how+to+be+a+quick+learner PDF link annotation
    • http://ramidavukul.medianewsonline.com/88918197553.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/88731569315.pdfIn PDF document text
    • https://gidixolatuloxag.weebly.com/uploads/1/3/1/0/131071157/6312238.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/a7idnif/well_developed_communication_and_interpersonal_skills_examples.pdfIn PDF document text
    • http://dabutaxezopis.iblogger.org/pajinel.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/K7ljb0r/nuzumu.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/huckleberry_finn_chapter_20-25_summary.pdfIn PDF document text
    • http://powusonuruw.22web.org/pojefiganidukupi.pdfIn PDF document text
    • https://gotanizanoga.weebly.com/uploads/1/3/5/3/135332446/jasawopevi.pdfIn PDF document text
    • http://fakaluwu.scienceontheweb.net/cane_self_defense_techniques.pdfIn PDF document text
    • http://nawavidosuk.medianewsonline.com/5750256709.pdfIn PDF document text
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/4904104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekemelegewimo.atwebpages.com/sopajod.pdfIn PDF document text
    • http://gafodix.myartsonline.com/add_text_to_photo_app_for_pc.pdfIn PDF document text
    • http://nevafofuvabovid.atwebpages.com/medical_biochemistry_by_chatterjee_download.pdfIn PDF document text
    • http://tuparibuju.atwebpages.com/tivojud.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/diy_bow_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/assembler_plusieurs_adobe_reader.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_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 5000 bytes
SHA-256: 3efd3d90924933c831a4c443e6c5508bdcfa9103e9a0900c95809434911004b9
font_01_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 11044 bytes
SHA-256: a8f3ee734b85312650a44fbcab10b23efcd69430e7f052a61faf10d49432af8e

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