Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc72c160d8b113a…

MALICIOUS

PDF

68.7 KB Created: 2020-11-21 12:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 212238988da6394662513eb0266a036e SHA-1: 6bf0d80d97ad8e6599782d93e72fd4d88d5900a5 SHA-256: cbc72c160d8b113ad172fa25749aadbbbdd3d0ae8fd63109e98287e9066c2a1e
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute or redirect to malicious content. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it 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://cctraff.ru/123?utm_term=mole+and+avogadro%2527s+number+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_5f97c2d07b7e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f8f233d348b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f94b1d835484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_5fb8498c340e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fa5e9b7b6aa5.pdfIn PDF document text
    • https://mepetimis.weebly.com/uploads/1/3/1/4/131483418/depenevopesepubet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_5f91f4f42a22d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5f930c55f02a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusori/chess_online_free_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/wifiragogevo.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/minecraft_full_version_free_pc_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ede1f8-f60e-484e-a9c9-bb74a7f11255/pocket_watch_identification_and_price_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b77d025-11c7-4766-a6f4-50dfc627a04e/starbucks_customer_service_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e85117-7aa6-47cf-bb51-0649ab12f6f7/giletur.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_off0000ce6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6F 5632 bytes
SHA-256: ad791187937cf69c5053ea509acd39789b7eefb47c3a8a9f39f2896afa2b3ed7
font_01_sfnt_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 10684 bytes
SHA-256: c121da99869f57a0cea8fc1a2830f7ebbd057fcc87bc032d77c4b42b3c87b78d

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