Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c9cd97e43d54c3…

MALICIOUS

PDF

69.8 KB Created: 2020-12-27 20:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 902f9ea817f9beb09b712e60581198c9 SHA-1: ed80beb23c7b82112e9d2f2037f8bd31cde39810 SHA-256: 32c9cd97e43d54c3659d22fccee5a98421aeea61bad0a9fdc1686bcb50deae4e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary external links, 'https://trafffe.ru/aws?utm_term=human+body+vocabulary+worksheet+pdf', indicates a lure to a website. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/aws?utm_term=human+body+vocabulary+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5f9276f79a16f.pdfIn PDF document text
    • https://lodufowuk.weebly.com/uploads/1/3/4/5/134593986/4620923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5fda4909e2933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_5fa0528d9e5e2.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/limot.pdfIn PDF document text
    • https://fugebigejajifad.weebly.com/uploads/1/3/1/4/131406613/2213627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_5fb3592adda21.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/50db2708-f3b1-419c-846c-260a9268b234/mode_one_semantics_and_scenarios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eecd1fd1-aaac-4480-af96-d7a5e7e1edb2/4024228918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ee2f02-1ee4-44ef-98ef-118e2489fa04/81152489484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8626c6-5755-4977-8bf9-d06485462c3f/vinigofuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160b246d-b36a-48c3-a56b-5d8d057f280e/no_data_service_temporarily_not_offered_by_the_mobile_network_at_your_location.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_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 5812 bytes
SHA-256: bb1afa05602bbd3f7fe6b5bd7e5476ecbd6cff3ba50aa9c5a4b7b6323e5af7a4
font_01_sfnt_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 10696 bytes
SHA-256: 680e467b815080c7ddb3900172c52d141a3b9ca13f700210240bac44ebccacc0

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