Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f40cf5cb731c564…

MALICIOUS

PDF

64.1 KB Created: 2020-12-23 15:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 91d2bb35703f5f34b1539a2c3d2a71d1 SHA-1: 22f703305d329adc61eeefcbf72236927523db04 SHA-256: 8f40cf5cb731c564feb38a7f48167a88a0e6c0e4eb55b08ae7b2edfab7129189
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 document identified as malicious by ML classifiers and ClamAV. It contains an embedded URL that leads to a suspicious domain, likely intended to host malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to educational material, aligning with a spearphishing attachment attack pattern.

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://trafffi.ru/aws?utm_term=expanding+single+brackets+worksheet+year+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418791/normal_5fdacc960430a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_5fde70d8c2a06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_5f963b5f41fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_5f8e863d95a92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_5fbf682475abc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450732/normal_5fc303736bb98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fad6865973b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410714/normal_5fd929c4cb239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_5fbf40120c71c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_5fa0dcfbcc263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_5fab89f3b52ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372721/normal_5fc4775321c91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5fe267b86e477.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/dd22420a-700c-4c84-a883-e7d6c8115ba8/77142427267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f85aca8-3aa5-4333-8e01-2364a768e7f9/high_school_sociology_curriculum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd63f67d-98e6-40f3-9a1c-54a9a612a479/xutawibasop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde242b4-462b-4936-b15c-4ad5c4a8d882/1388277420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac18e192-fbde-4fb1-90eb-6dcbd3b3a686/bl2_bee_farm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ab86ea-980f-4390-9581-b91e24f1a625/tlif_definition_medical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e39586-865a-4010-a659-d027f91c3dcf/7_levels_of_communication_free.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_off0000bbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD9 5836 bytes
SHA-256: 455aef8bf678712bd1e2fbd203aeb2ef55b0dda653ba9e640ab44a8cb77f8abb
font_01_sfnt_off0000cfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 10388 bytes
SHA-256: d70b8ce60a24d1e8410d51f75e79b0195f7d53e6f9ea916a842b21c752c0311f

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