Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6ea27fae937a64…

MALICIOUS

PDF

64.1 KB Created: 2020-11-10 05:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54d71b82864e76ededf81fa05dc57f38 SHA-1: 12a24ff780a7cf4abb68b81c323871839ebd487a SHA-256: 6b6ea27fae937a6437d2f89dbe34eb8c9f0ec6956f3805cba6b8901641258688
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. ClamAV detection and ML classification further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious content delivery mechanism.

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-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://traffine.ru/123?keyword=psc+academic+calendar+2019+2020
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/jinitorip-bolag.pdf
    • https://cdn-cms.f-static.net/uploads/4406481/normal_5f9c6cf348942.pdf
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5f9d89b44a63a.pdf
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5f8d875f5725e.pdf
    • https://kisigitoteke.weebly.com/uploads/1/3/3/9/133997396/gejexidotim-sulotug-pezelidulawaza.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/ratefunerod.pdf
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/8d237.pdf
    • https://cdn-cms.f-static.net/uploads/4424013/normal_5f9f36ece9905.pdf
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/5683587.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a8557419-170a-4e36-bdf9-dd4aa722ea08/pefomadenikoxopiwibanitaw.pdf
    • https://s3.amazonaws.com/rebesudanolo/catia_v5_tutorial_download.pdf
    • https://uploads.strikinglycdn.com/files/b0e7ed87-3ccc-4d89-9b64-aa42cf983e6d/myers_controlled_power.pdf
    • https://uploads.strikinglycdn.com/files/212fcbc1-360c-4921-ae18-0e7f9bd4dfd1/91556357640.pdf
    • https://uploads.strikinglycdn.com/files/7ac2bb0f-a73e-48ca-88c9-961b9e6b017d/83067141268.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_off0000bd14.bin
954862139fa07a95a3196251ff994676a134012d9ae723711193fb76590334ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD14 5568 bytes
font_01_sfnt_off0000cfec.bin
e9da78c7eaff6de6dcd931b6faaa9e85dfd77cd76d5872d7620aa8291f9ed45e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 10528 bytes