Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a7b80019802d03…

MALICIOUS

PDF

74.2 KB Created: 2021-03-21 11:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ff90149bf2dc0bb6e760d3795a0003 SHA-1: 76ba139a10f3153761e19a6852e8fef677ec4e6d SHA-256: 87a7b80019802d0325d2c77e00a2fa757ea7ca0085dff1c794028e15e9cb90ac
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs are the primary indicators of compromise, likely serving as lures or downloaders for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/award?keyword=catabolismo+pdf+unam
    • https://nukukenodaxuw.weebly.com/uploads/1/3/1/3/131384044/cf473e7d.pdf
    • https://loligotobufineg.weebly.com/uploads/1/3/0/7/130739446/b33b697.pdf
    • http://nibatuw.iblogger.org/fujepuboxekizavik.pdf
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/fiwagut-zemukovamezoz-banuw-zotola.pdf
    • http://joteruraxa.22web.org/zolida.pdf
    • https://vikaworapelesob.weebly.com/uploads/1/3/4/7/134702945/damanerof_roxowuzumupug.pdf
    • https://pozukelemiku.weebly.com/uploads/1/3/2/6/132682282/ff081f516d0018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e8b45c3c-81f5-4c53-8ebe-c832c132e50d/duct_tape_corset_drag.pdf
    • https://uploads.strikinglycdn.com/files/00c394e9-5d9e-4351-b527-44cc49cd759c/superman_graphic_novels_comic_books.pdf
    • http://ralopokizuneza.rf.gd/scanshell_800n_calibration_card.pdf
    • https://s3.amazonaws.com/xapidajovaji/71173637301.pdf
    • https://uploads.strikinglycdn.com/files/5e6646af-3bd8-446c-9d8b-498b4543c994/parts_of_speech_meaning_and_examples.pdf
    • https://uploads.strikinglycdn.com/files/f30c9b23-eece-42ab-8dc6-086a41949d8f/how_to_structure_a_chapter.pdf
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_ca1c8451184940c88b1e0f6ea93078d5.pdf?index=true
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_07998a52c67a483db82017f450c2f43a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/02aa5e72-b6d0-494c-9664-0a5c3a8ed29d/nonelerujezuw.pdf
    • https://s3.amazonaws.com/kubafezin/6785493238.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_off0000e598.bin
5d1e842d315acc2c7d13c72afa33635646f3f36c433ba04e9aff3d9dd67ff131		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 5136 bytes
font_01_sfnt_off0000f6f5.bin
448e95ca9da0dc49eb7070f115d27cfbb72d4138730360be678842f367b4af74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 10984 bytes

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