Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bfcc51b036e025…

MALICIOUS

PDF

77.5 KB Created: 2021-01-06 03:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4ddc122e47406e61c66472d7401c560d SHA-1: 7576134c68064ed95a2d12ae7e98259e38587b52 SHA-256: 17bfcc51b036e025b7dfa5f95e9b62babde4056188e1389493141b0a71a5b5b7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to seemingly benign resources, but also includes a suspicious URL (trafffe.ru) that is likely part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=spanish+numbers+to+30+worksheet PDF link annotation
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/9a8b9a0f95ab82c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481403/normal_5fdb6a0713e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f88ce496fec2.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/bb99669d-ce04-4cd6-8007-772651601877/ck_phonics_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/4774297243.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/93985875403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc71766-4477-4e9f-9a3c-02ca08706cad/niwop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4708320-f770-45dc-afa0-3ef7c4b73fe9/zobemikogufulomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3a4f304-bfb0-45d6-9bfe-268928bb1e92/sofiperata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2c6225-8c96-4a79-8e51-3257df8b2a74/rwby_ursa_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ba8a6e7-bb70-4182-8523-5909770cf2b2/wizaw.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/76899771291.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_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 5732 bytes
SHA-256: 7035ec284ac54986b046ff1f0f9ee7b6e122fac6df823428f627a2c824d536df
font_01_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 12184 bytes
SHA-256: 763d455577e1e6c11769ed633c465c84dcd3f2f6b0061110301040c3ce803068

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