Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fcaa89c7f30062…

MALICIOUS

PDF

59.2 KB Created: 2020-11-11 20:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e7f02e3e8d288280282ec890965e0822 SHA-1: 52d6a52fef8233867fd54280fb0ba0bb8f0e72b7 SHA-256: 02fcaa89c7f3006247580c0477b6f019231a879909fbe441236ccd0ed0cb47c5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs points to 'trafftec.ru', and another significant link is to 's3.amazonaws.com/zonebon/rumafukijiputew.pdf'. The document body, though heavily obfuscated, suggests a lure related to an 'Enzymes activity worksheet answer key'. No scripts were extracted, but the presence of multiple external links and the SEO link farm heuristic strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=enzymes+activity+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445532/normal_5fa7452910970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_5fa00af2a60a5.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/jetikugagivov.pdfIn PDF document text
    • https://xufitagetibo.weebly.com/uploads/1/3/4/4/134486135/pegeworexulekevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f8df74f4b3d4.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/zonebon/rumafukijiputew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b980655-3951-4895-b990-0fcfff7c974f/logitech_mx_ergo_plus_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/brain_hat_image.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/s_means_ownership.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/62962831373.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/matekofuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ada8c7e-d15f-4f18-b797-1eb0a836aecc/midterm_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/15068550660.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_off0000acb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB4 5332 bytes
SHA-256: fb7ad09ec0204947b9c382ca2eb4f71a416ca365d0aa2233b127789e2a27d49a
font_01_sfnt_off0000becd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 9800 bytes
SHA-256: c28dd6a8d0deccc4814752fbe659fa7e7e90fd1621828af244c8442122145d69

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