Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfa18b3da6b6799…

MALICIOUS

PDF

74.3 KB Created: 2021-03-31 21:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77e3c4284c5ddd36f9efae776ea93940 SHA-1: 5275abd3f7c3351508f8cdecdfc2070fc5d76701 SHA-256: fbfa18b3da6b67991ba1654bca5cd3c4ddb141c15cba811bb40516d0e2627bdb
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, with the primary URL being 'https://mezovuduw.ru/award?keyword=auxinas+en+lentejas+pdf' and a prominent link farm starting with 'http://idealica-official-it.website/rpg_maker_games_android_apk1n698.pdf'. The presence of a link farm suggests an attempt to manipulate search engine results or distribute further malicious content, aligning with phishing or SEO spam tactics. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=auxinas+en+lentejas+pdf
    • http://idealica-official-it.website/rpg_maker_games_android_apk1n698.pdf
    • https://kinimozudex.weebly.com/uploads/1/3/4/4/134498073/3135842.pdf
    • https://wuxebejodivo.weebly.com/uploads/1/3/6/0/136030931/wotaxudezilonitexes.pdf
    • https://cdn-cms.f-static.net/uploads/4421466/normal_6050c571f2382.pdf
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5fe2c1123eacb.pdf
    • http://pet-guru.shop/36875775536ehug8.pdf
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/dewutimamabe-tipuraligisoziw-wexovozonisidi.pdf
    • https://cdn-cms.f-static.net/uploads/4365607/normal_6063f068d26bb.pdf
    • https://menuvinowit.weebly.com/uploads/1/3/5/3/135320060/5393592.pdf
    • http://ledy66.net/skater_aesthetic_wallpapergkt0l.pdf
    • https://cdn-cms.f-static.net/uploads/4449004/normal_5fe9092bd36f9.pdf
    • https://static.s123-cdn-static.com/uploads/4464865/normal_5ff2e93934068.pdf
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/2272001.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_aacf28bef8d14d5390350275afe55ecc.pdf?index=true
    • http://ravakalamixalu.epizy.com/53414079313.pdf
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_f1c68c0974a94dc7995f1f7c515a6358.pdf?index=true
    • 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_off0000e399.bin
1d4f2897ce453c082d228b4a6d150045c2bda833ebbe0f45e1292ee09a61a512		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 5072 bytes
font_01_sfnt_off0000f4fd.bin
87dc07af7480fff03fd2bef3d6fcfd834367ba5d0b9f9bda58126ab72f62ea56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 11648 bytes

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