Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d53a93dc818476…

MALICIOUS

PDF

88.3 KB Created: 2021-06-13 12:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5afcf648a483c5775618702c405499e SHA-1: c56fd8e05ef7a1e746163c3d6533ba07d4d981b5 SHA-256: 29d53a93dc81847623ae954b94f48425074f4685265f33e2547fdc149936e4de
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to 'kuzutuzo.ru'. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to academic performance, likely to trick users into visiting the malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/123?utm_term=poor+academic+performance+of+students+thesis
    • https://metiganad.weebly.com/uploads/1/3/4/6/134659194/fofumigowexu-dupatogi.pdf
    • https://jimepozuzaz.weebly.com/uploads/1/3/5/3/135350414/2406473.pdf
    • https://jupikojeba.weebly.com/uploads/1/3/0/9/130968920/girabenurum.pdf
    • https://bubefotuline.weebly.com/uploads/1/3/1/4/131438432/5800627.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a4e97cfa-661f-43bb-a002-e3bf21548bab/farberware_air_fryer_toaster_oven_chicken_recipes.pdf
    • https://uploads.strikinglycdn.com/files/266344b5-ac42-4544-b5e6-c259c23a5746/63957467445.pdf
    • https://uploads.strikinglycdn.com/files/dee1aa85-d703-4f91-8bff-e7b99aff0b4a/71981484699.pdf
    • http://foziwedugumu.pbworks.com/f/rolujopuvewaw.pdf
    • http://dibesusajob.pbworks.com/f/how_to_use_conair_compact_hot_rollers.pdf
    • https://uploads.strikinglycdn.com/files/69a13285-aa10-4767-bdbc-d35c2fc6a5b6/xixawagijofiraxuruxo.pdf
    • https://uploads.strikinglycdn.com/files/a7f074fd-2e27-4155-9317-a2cfff33d47a/can_epson_workforce_2850_be_used_for_sublimation.pdf
    • https://uploads.strikinglycdn.com/files/73bca25d-0ff6-47ca-8599-2da318606e34/94191083822.pdf
    • https://uploads.strikinglycdn.com/files/ea04bfb1-7e63-4af4-9efa-cb356613b17f/busoxudotemodoxekop.pdf
    • http://najapenoz.pbworks.com/f/74636163311.pdf
    • http://wodupabizel.pbworks.com/w/file/fetch/145154802/what_is_meant_by_an_endothermic_reaction.pdf
    • https://uploads.strikinglycdn.com/files/41a4ae6d-03ca-4e35-837c-1389d5191639/zolonepavito.pdf
    • http://gebozuj.pbworks.com/w/file/fetch/144855765/65061629550.pdf
    • http://rupebaxo.pbworks.com/w/file/fetch/144607818/nimofofevas.pdf
    • http://mulasamesi.pbworks.com/w/file/fetch/144593475/download_age_of_empires_2_via_google_drive.pdf
    • http://bulezesikur.pbworks.com/w/file/fetch/145233900/49768356725.pdf
    • https://uploads.strikinglycdn.com/files/887124e3-3457-4907-910b-21628da7cf61/why_is_my_amazon_prime_not_shipping_in_2_days.pdf
    • https://uploads.strikinglycdn.com/files/50ee94bc-6d38-4782-ad4b-515a6bab82f4/77659408032.pdf
    • https://uploads.strikinglycdn.com/files/6f447328-8e0d-413c-be63-bfc6708c00be/how_much_is_a_battery_for_a_2008_ford_escape_hybrid.pdf
    • https://uploads.strikinglycdn.com/files/8138fc4d-b817-4304-897c-8954a67583ed/seboxazubobupiverewe.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_off00011b68.bin
daf0586118f5c8b47b595228ae0cb4fd9bbca17690b22e5c519f2ad6965f2f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 5364 bytes
font_01_sfnt_off00012d7d.bin
4b010f6c5205288c12f742ff1e584a85597c451acec04018e24cfb6685fdd6e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7D 11116 bytes

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