Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dd353601c38fc2…

MALICIOUS

PDF

59.3 KB Created: 2020-12-26 07:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0076724636053b5cadebb1b604611362 SHA-1: cc9f3fd09d8df4dc3a65afdde853cbbe7eb1b64a SHA-256: c8dd353601c38fc2e36d8009710bc372f2c320896f5cb739ec3c70117f821988
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF with a high ML classification score and a ClamAV detection indicating it is a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Kuroshitsuji english dubbed'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://trafficel.ru/123?utm_term=kuroshitsuji+english+dubbed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484609/normal_5fd130d0b5e49.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/mevanowimew.pdfIn PDF document text
    • https://cdn.sqhk.co/jasorevujoxu/MTBp3gi/bowling_speed_measure_app.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/0e3a6700-f3b2-4816-b65d-00dcf22f38d8/elminsters_guide_to_magic_the_trove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1899e1e-a3df-4057-a646-801e32b8056e/65157217510.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/72537477292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94cb743c-094c-409e-b0ea-5779406284a3/big_smoke_order_script.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/xutebikod.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_off0000b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 5064 bytes
SHA-256: 5ee666e77c447b7f289ff0d44bb834cf3bf85a05bacc09e93f69f93c67e99572
font_01_sfnt_off0000c370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC370 8784 bytes
SHA-256: 3f3fdc606b2dca6129ab5c1fc2d31b6f5052ae7b7260f718d08e84fa1ac441df

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