Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22a9e92e6fb1649…

MALICIOUS

PDF

92.5 KB Created: 2020-11-19 08:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 836584bcd54ea9c98b0358ef2c965179 SHA-1: 197a9f6a1d86395ae1ae8796e47b0f3fc4ea86e7 SHA-256: a22a9e92e6fb16494eb6f4279d5d6c55d7a67c22e508fe313604bc5d9af74d0e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic firings indicate a PDF link farm designed for SEO manipulation, likely intended to lure victims to malicious content. ClamAV also detected this file as a phishing trojan.

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
  • 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://traffine.ru/strik?utm_term=goku+god+of+destruction In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f88aac52c7fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f9e09b21cceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5f874929774cb.pdfIn PDF document text
    • https://jafowunasakubiv.weebly.com/uploads/1/3/1/4/131437393/kumepawaku-wetepam-tesefegojo-nirozaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f870bbcd4a6a.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/92e9c929-65db-4861-8bdd-e921add3e026/22625613122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e39565-7157-4e06-b759-d90fcbacd1c2/74048780704.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/exploration_merit_badge_bsa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537c1ab4-17dd-42eb-8d1b-e701bd4b4e71/ripeditejadawuderubuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7cbfe99-7d16-49d8-88bb-20e913d93a26/77293101464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e006edf-01c0-47e7-a8ae-96ba456d9034/davukuterikikiwon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 5316 bytes
SHA-256: 4ed099d015efbf25ae66c848ea342889d6faea30b47c9674568f9e76b8b733c4
font_01_sfnt_off00012c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C05 5040 bytes
SHA-256: 1e8bd6a3b4117e43da5018643ed3e8b6a28824364ba036550a3bea0956e2e070
font_02_sfnt_off00013d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D51 12132 bytes
SHA-256: e8c613df5550b8648f7c3f0f0917b9e174397717c403d6c02c75662041ff3c80

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