Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36e68398c4e76df…

MALICIOUS

PDF

67.9 KB Created: 2020-11-18 19:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 05e5ce4aedce9d0bb92ea5ae25369bfc SHA-1: 7b565da9d758987aa165624538804ba9173222f1 SHA-256: f36e68398c4e76df8441ff467bdfb8b464dbde2f1e610d54ff08591d6887aa31
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though partially corrupted, suggests a lure related to calculating a 'specific rate constant k', which is likely a pretext to disguise the malicious nature of the PDF.

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=calculate+the+value+of+the+specific+rate+constant+k PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0e7063-f769-4e57-8dc2-c7388cd7c6f6/98160303715.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/40882451451.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/primary_talks_may_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7bddb4-a0bb-4871-9ccf-2a182143fa52/bounty_hunter_1100_metal_detector_ma.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/hoover_garage_vacuum_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f33691-e662-4e1b-807f-5edb965914e3/tenolurokokewob.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/kedokabuvejikenalekanefe.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/80582960758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b011371-417e-4285-9b23-a0d23b9f8d97/98502115970.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/camo_insulated_boot_covers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7331b72-0803-4fcd-9c33-b315033b7fe9/kipivex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b859803-1d66-479d-bd52-c22d433b162e/40651946172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1128399-6a31-4a11-ae4f-38ede03b5be6/4162547369.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/tonto_de_capirote.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_off0000c8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 5132 bytes
SHA-256: e78ed95102207aece37dc510723e78a78f0435122e8db9259ef2391d0f5f184c
font_01_sfnt_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 12252 bytes
SHA-256: 3b0fca6f131d496c82a8e8c977a56dd7793dba4f491b3d7555c6044dd84f9da7

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