Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33357d468a1ce6b…

MALICIOUS

PDF

80.8 KB Created: 2021-03-17 23:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93d4ebbff5e418e67572098346d230fc SHA-1: 4421f243c62bf45c3f9f10804d94427ca7bfe5ca SHA-256: e33357d468a1ce6bc1d51ad62a49e190f7fc7f67a2de5d452a9b808a91864921
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/aws?utm_term=review+qcy+t5+indonesia
    • http://tumbaa.space/tik_tok_videos_dance_2020gcm7p.pdf
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/fosiv.pdf
    • http://piredvizhnik.com/the_game_changers_book_reviewvjtgo.pdf
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/3d88a516db.pdf
    • https://mabalajobiken.weebly.com/uploads/1/3/4/0/134016714/7de8c60e233574d.pdf
    • http://lifeshop.pro/pukozobulamakfa94z.pdf
    • https://cdn-cms.f-static.net/uploads/4471252/normal_60299ed15de01.pdf
    • https://static.s123-cdn-static.com/uploads/4450046/normal_5ffd480a4144f.pdf
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5ff193de9d5de.pdf
    • https://cdn-cms.f-static.net/uploads/4418558/normal_602230c0785fa.pdf
    • https://viriparerari.weebly.com/uploads/1/3/5/9/135978168/tesatezawik-bibavupateri-nisep-gatov.pdf
    • https://tanavizone.weebly.com/uploads/1/3/4/7/134709943/7c0a7b094cee2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vopodopo.rf.gd/zone_of_proximal_development_examples_in_the_classroom.pdf
    • https://uploads.strikinglycdn.com/files/1d6b7645-9180-488b-9add-55822cdb2200/zisilofexizasamofav.pdf
    • https://uploads.strikinglycdn.com/files/a975f603-cbf4-4239-b009-dc476c07a25f/the_chronicles_of_narnia_prince_caspian_free_download.pdf
    • https://uploads.strikinglycdn.com/files/b6c185c6-cc38-4e75-b048-303366378d98/cos_to_degrees_python.pdf
    • https://uploads.strikinglycdn.com/files/456abeeb-083d-4656-a78c-0f569c54d61f/93321709515.pdf
    • https://uploads.strikinglycdn.com/files/7f39e708-d2f7-4346-be28-cf380fe32a57/kokidegexideruf.pdf
    • https://uploads.strikinglycdn.com/files/fa92623a-936d-4d80-a7a8-5e8d8a8dbd9a/nobujanozatir.pdf
    • http://bogetozepopizir.rf.gd/samsung_grand_prime_pro_ram.pdf
    • https://uploads.strikinglycdn.com/files/4c583c89-fee7-4d17-87f2-697a90df16fe/42607700316.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c5.bin
58c36b2dd53d4661c4492fd6ce82b8a36b5ba956ae6a2c0962f7d6675f7da22c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5316 bytes
font_01_sfnt_off00010314.bin
bd79b1ad989001f19cafd74b290cb4fed42a5b789b7609c126f1e1e31313de59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 22308 bytes

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