Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33dbefce8b01077…

MALICIOUS

PDF

71.0 KB Created: 2020-11-27 11:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a89bbfc5bd608d0c89ca417f21d5d9 SHA-1: 7f93455278f829f966668783a854f7c1968d4d9d SHA-256: c33dbefce8b01077e335a1ae13c3633a595929c47c739bcedd690e92db4b8632
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a mass external link farm, with numerous URLs pointing to other PDF documents, suggesting a phishing or SEO poisoning campaign. The primary URL, 'https://traffnew.ru/aws?utm_term=arkabutla+lake+fishing+guides', appears to be a lure to disguise the malicious intent. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=arkabutla+lake+fishing+guides
    • https://cdn-cms.f-static.net/uploads/4412778/normal_5f98f69100c42.pdf
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5f9a4997bf77a.pdf
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f87d40ddb8de.pdf
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5f9086438562e.pdf
    • https://kibodowusi.weebly.com/uploads/1/3/4/5/134588916/8286799.pdf
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f87266c8aa9a.pdf
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5f8e3375e0b6c.pdf
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/resujedefovalex.pdf
    • https://cdn-cms.f-static.net/uploads/4450141/normal_5fad9ebf3cab4.pdf
    • https://memefuzagimo.weebly.com/uploads/1/3/4/6/134612336/wivonob.pdf
    • https://cdn-cms.f-static.net/uploads/4456369/normal_5fb2645d76927.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f349c4fc-9e3b-467b-9f90-7de92804d256/guxopibosedoxem.pdf
    • https://uploads.strikinglycdn.com/files/d0e70366-051e-4d76-9bbc-ba95e80c3d66/megodugoxuxekewuposokomoz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7dc.bin
0d78bb80701bb1fcec8c1408bab8758fc49e92bd879270e7187a49b1404b506a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 5364 bytes
font_01_sfnt_off0000ea11.bin
68896ce7fa222c59b11d0c0d2e948f887ebba1e0ad2c241e7a24c001b77795d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 10912 bytes