Malicious PDF — malware analysis report

Static analysis result for SHA-256 864dcdefa71e942f…

MALICIOUS

PDF

66.7 KB Created: 2020-12-14 21:08:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 621c56952835e6b0cced7e1f92d35ce3 SHA-1: 432950894ef836a4f6029f8e2ffda86633bae9e2 SHA-256: 864dcdefa71e942f41b1a7521a4aeac52c78985fe094c83d920ddfefcb7919f9
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including a critical finding of a link to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to manipulate search results or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=westinghouse+tv+remote+replacement In PDF document text
    • https://sinixamaruxibul.weebly.com/uploads/1/3/4/6/134653816/wuduwutekunu.pdfIn PDF document text
    • https://pukaxonimuno.weebly.com/uploads/1/3/4/4/134435323/bewoxameval_wizaxuwafig.pdfIn PDF document text
    • https://mikakegurotitu.weebly.com/uploads/1/3/4/3/134309030/gusimikajexofi-xujokira-fevoganaliva-xewumudu.pdfIn PDF document text
    • https://xawalovu.weebly.com/uploads/1/3/4/6/134652108/4903104.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/2957024.pdfIn PDF document text
    • https://libuxave.weebly.com/uploads/1/3/4/4/134438459/2347282.pdfIn PDF document text
    • https://sakenudawajaka.weebly.com/uploads/1/3/4/5/134595508/sawaj.pdfIn PDF document text
    • https://pudisipilusive.weebly.com/uploads/1/3/4/5/134597375/23b21376554300e.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/lipew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc54070c14dfd36fe0e2b11/t/5fd1e286fec2791e310949ed/1607590535399/wonuj.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/allbirds_size_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5588a97599144eee4d6c/1606374792362/cps_student_code_of_conduct.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64e6c2e34347c70694bb4/t/5fce18eafe657040d5b9cd89/1607342318248/pizza_slice_near_me_now.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/selowadixalajedural.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe193564571256540290d8/1606293813512/xorufusetewobajovafurivam.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1a50145a8629dc78f88b/1606294098188/19033922523.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf545a3c6ccf69f3554089/1606374490299/finger_lakes_trail_letchworth.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_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 5420 bytes
SHA-256: 4889c2aa1641d51808d2706435a5e4d1e895c9c4c471368e15226e00d12febd0
font_01_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 10324 bytes
SHA-256: 4e4f5cc4876b1ce706bbc110e0ddd1216e3e0505f6fd046bb7a15681059cfcd2

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