Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a1c21a4a1980ca…

MALICIOUS

PDF

68.0 KB Created: 2020-11-14 03:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 36762889b7e31c59ebfd51cc7bc88476 SHA-1: 1d1e9a01df00dd874b7e9f5005c5a039d4ca9fe7 SHA-256: 87a1c21a4a1980ca414769a8fed8bee0cf8488218c3892cb3eb98b1003622686
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One prominent URL, 'https://traffking.ru/strik?utm_term=my+homework+lesson+6', is directly embedded and suggests a pretext for user interaction. The ClamAV detection and ML classifier further confirm its malicious nature, likely related to phishing or malware distribution.

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
  • 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.
  • 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://traffking.ru/strik?utm_term=my+homework+lesson+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377120/normal_5f93ee6615112.pdfIn PDF document text
    • https://lirutuve.weebly.com/uploads/1/3/4/4/134462413/zovel.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/d2b09d6.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/4264123.pdfIn PDF document text
    • https://dizuxegukus.weebly.com/uploads/1/3/4/6/134624336/c18107a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_5f9b260c6987a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a9f17e-b162-4188-b7ca-d1d1132ccc55/pigizatikizujowukaxid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa5c53c-47b9-49ef-bd59-e883ebc5850b/buzukafolefup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4322c3-7200-4c34-8270-985f1eb632d7/dragon_ball_z_the_return_of_cooler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc2e5f4-acd7-481b-859b-68ad8286e5d4/49557793322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2175246a-96b1-491f-b155-1de7c98e3c0f/70295712634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ef61df-5ade-4c51-901f-edcd00048d2f/22645443841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0a6483-baeb-41f4-8156-082ef7a59a69/tonusonivopob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb8f4e4-c64b-4b48-85a3-dfce6160c5da/tree_of_savior_bullet_marker.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_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 5132 bytes
SHA-256: 8dfbb00d794eac5254f46e4c7600e9d97abbdb053ed06bf88224f7a4a57f2fa4
font_01_sfnt_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 10428 bytes
SHA-256: c06a32b9c1483bc79ee5bbff76d6664a7bd1ac3b8bd558c655f9ffa10da8c00f

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