Malicious PDF — malware analysis report

Static analysis result for SHA-256 d904e9fce0e61b58…

MALICIOUS

PDF

81.8 KB Created: 2021-05-24 21:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b8ff3e350e0cfe5e20ca916eb52c353e SHA-1: 511eacd298f0671dc0f2694a8c9b611eaab02acc SHA-256: d904e9fce0e61b58c15580bcff5dad4bfc73eec08f372cc310347db36cd81ef8
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, likely used for distributing further malware or phishing content. The document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/strik?utm_term=cbse+class+12+maths+textbook+part+2+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368485/normal_601c7aaf35ae7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5feb6d4caaa3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5fe265bb383bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455183/normal_60503eedaf891.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476133/normal_5fe0ab96555a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_6060d0ee2fabf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455196/normal_60087dac52f4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c300ae4-ac4f-4159-af0e-36757eb877e0/huckleberry_finn_quotes_chapter_1-8.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/jexujinoranif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c462c6-c24a-4109-a784-8505f144a1f4/dupirurenobodurorozufifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865059e5-c72f-4c9a-826a-45a5ed2a4543/how_does_zotero_work_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9e0b2d-5cbd-43cf-b3d7-8e49711dc57b/rheem_hot_water_tank_costco.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/canada_boat_exam_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aaa9a4a-cfa1-44bf-b234-54d831357799/lupejutiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f8d087-fd7d-44b2-aa1f-e64ae810be8e/what_do_chinese_symbols_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/fabomunexozebikupekeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96189c81-cf3b-4af9-9449-6fe87a6d5121/64305474469.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/hammerhead_twister_150_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/068babd0-44fd-427e-a6b3-179efcae2a68/29720633937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64534cb-e7f6-4e32-9d0b-7356825a0408/is_samsung_remote_universal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f48106a-8897-4031-9619-16b4f68b79c3/can_usps_deliver_on_sunday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55cf8c73-4167-469e-9cd8-7b5aa20d1485/75740985557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25886e5c-d9e5-4adf-8c03-f215e34bc675/vobowobapax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 5756 bytes
SHA-256: 91d46d987047f158cb19c5193491d5b7e880aa179c9d9efff30db543303dc2f2
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 10420 bytes
SHA-256: b25ed7e39d4367c4e93dff891e5826404267b88ddd08f4939bcf8182877c244c
font_02_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 3484 bytes
SHA-256: dc9d33f94e579a7a6e1e4c7fc56671d439d7175e3e4894ae7c33940c02c085e6

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