Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aeb20399693d968…

MALICIOUS

PDF

72.9 KB Created: 2021-03-02 23:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fbf0880fc7d64b5f8296736e339fae20 SHA-1: 1f0f7ae74e9117cf147d9f411e2a33c9a9e5bca3 SHA-256: 4aeb20399693d968d9617f091bf28611647858f757ba9bfe4679374202b55a7c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or phishing. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leonvi.ru/wix?keyword=how+to+pinstripe+car+wheels PDF link annotation
    • https://tufamivobanode.weebly.com/uploads/1/3/0/8/130814219/9055176.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/18625.pdfIn PDF document text
    • https://venumokup.weebly.com/uploads/1/3/4/8/134866871/cdae993.pdfIn PDF document text
    • http://cabinetshub.xyz/heart_of_darkness_full_text_with_page_numbersum8he.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/7404369.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/1993623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5fd97d0393b95.pdfIn PDF document text
    • https://fimegelepa.weebly.com/uploads/1/3/3/9/133999933/turegubup.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/begib.pdfIn PDF document text
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/7139399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462096/normal_5ff7717299f62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447433/normal_5feb6b4ad963d.pdfIn PDF document text
    • http://expressday.online/agree_or_concur_crossword_answer8h78u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444852/normal_600ca2ed5e6ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketugida.rf.gd/89626345727.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_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 5076 bytes
SHA-256: 4378f84b2e8d6372518d93e82ef5c5cbe74adb77a38a858f94b5e6c41cfab91d
font_01_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 10196 bytes
SHA-256: ea780289b1437bec41549b0fd089895c4ba9c8a1b5444179d115953a9290829c

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