Malicious PDF — malware analysis report

Static analysis result for SHA-256 882cf31ffacc3d61…

MALICIOUS

PDF

62.6 KB Created: 2020-12-21 03:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f4a1dc2c85fc9ef1f64af8459fb6ddbc SHA-1: e5a749f8ca5be22ca4ef6deeb85b873bb2acea09 SHA-256: 882cf31ffacc3d61c4080bb44232ccf6cf58dc530d9e4a6d684677fe81fa9e31
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'trafffe.ru', which is likely a phishing or malware distribution URL. The document body, though heavily obfuscated, appears to be a lure related to 'farm town free gifts cows'. No scripts were extracted, but the presence of an external URI and the nature of the ClamAV detection suggest a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=farm+town+free+gifts+cows PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383798/normal_5f8e5cd422d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_5fb2c7e275d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465701/normal_5fbb5cd7b78ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5fae994aaa6f3.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/fd76e7ac-94aa-4cdc-9492-a695b82d63f6/youtube_how_to_rescreen_a_window.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae27485-7128-412a-8971-ba08b9acd8e6/xebatugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0087922-f834-4d4a-b7f8-a4fecda4949f/informative_essay_examples_for_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/vibajiwifuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef863996-dc40-4e5b-ac5b-9f9589cb429d/44886106325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be29ff2-bb5f-46b9-92fe-bcd42d5ae987/41375409475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a53249d-f6f3-46e0-84e1-d485ffe296b1/34682743493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc32d3b1-6280-4b56-ad19-c41dfb7cb54d/51939331468.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/meilleur_antivirus_android_gratuit_sans_pub.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_off0000b8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A4 5216 bytes
SHA-256: 6d280fbf4d5ead07adc7f7a34df4421b81ba7423a54e51b333f3f80601d932a3
font_01_sfnt_off0000ca69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA69 10376 bytes
SHA-256: 15627505a4ae082f07de97e8a25c50518fa2ea8434408c281fc93e354c9cfd30

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