Malicious PDF — malware analysis report

Static analysis result for SHA-256 bebacfdb1e9b46a3…

MALICIOUS

PDF

85.7 KB Created: 2020-11-10 22:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 796303372d1f0754184654e9c5920ea5 SHA-1: d1a4b9f886b67cfe4f87f80d05ceb8a681f93e18 SHA-256: bebacfdb1e9b46a3b04556f76a177b7772754ccf34fece5b89ea30c014de73b7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links intended to manipulate search engine results or direct users to malicious content. One such link, 'https://trafficel.ru/123?keyword=white+noise+don+delillo+pdf', appears to be a lure. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?keyword=white+noise+don+delillo+pdf
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5f91165720a6b.pdf
    • https://cdn-cms.f-static.net/uploads/4406516/normal_5f9c04752d4b0.pdf
    • https://cdn-cms.f-static.net/uploads/4378843/normal_5f8de3ce3b43b.pdf
    • https://cdn-cms.f-static.net/uploads/4380527/normal_5f8fe1acd8957.pdf
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f88040a53c41.pdf
    • https://cdn-cms.f-static.net/uploads/4382778/normal_5f90a952877bd.pdf
    • https://jerewetazawupej.weebly.com/uploads/1/3/4/3/134384555/4638508.pdf
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f899cb93e9c3.pdf
    • https://wivepeweg.weebly.com/uploads/1/3/1/4/131455463/c63b17.pdf
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f8b1f33db724.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vapelurowar/11444667939.pdf
    • https://uploads.strikinglycdn.com/files/32912a31-c5a1-4714-9bab-dcf1cac8d80d/85358652381.pdf
    • https://uploads.strikinglycdn.com/files/3b8f3b2f-6430-4f5d-a598-c69ae1cb8f3c/kavedosa.pdf
    • https://s3.amazonaws.com/pisik/41155743464.pdf
    • https://uploads.strikinglycdn.com/files/a098704e-c0db-4847-8e95-3e836496df8a/numerologia_cabalstica_clculo.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_off00011192.bin
98f6b74e4e314d62973104930449846cbe36386aa8fc35840a84414c284a32d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 4836 bytes
font_01_sfnt_off00012216.bin
59f8d8d16f9647f5dc80fbb38819bf4befeb0234d025a404b55026909dca613c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 12020 bytes