Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c823aa02643a8c…

MALICIOUS

PDF

68.5 KB Created: 2020-11-19 22:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1c754bc6ffcb11954de5ec92d5b076f7 SHA-1: 20f36d7e6961e3d19e2ac21996232ab6324f2451 SHA-256: 63c823aa02643a8c79f0d7ae979ecc95174f641409ae8a41fcbf6ed0c03cddae
214 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. It contains a large number of embedded URLs, with one specifically identified as a redirector to malicious infrastructure. The presence of a link farm suggests an attempt to manipulate search engine results or distribute phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=folding+paper+8+times+half In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f8cb89787d99.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/kutujesovinabojudul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5f90869eae6fb.pdfIn PDF document text
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/nigud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f8ee9f623504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5fa7fede47421.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/tapalisizemef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5faaf69e004a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_5f9290947571b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f9c273963a15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_5f920dead9816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445869/normal_5fa24bf8046a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/namelevonazobijofo.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/vikerunolizibizu.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_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 5604 bytes
SHA-256: 80633343d3e6bddee8dc82cb798861ec3c177201153a9bcd9ce018f8437782da
font_01_sfnt_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 10292 bytes
SHA-256: a2899720592243463ba29518bd69a9b3de22bc6e7ff5c3bb165ea1734e93023f

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