Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacd92f1de2d3975…

MALICIOUS

PDF

87.2 KB Created: 2021-03-29 14:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e6f3dfa8e32ff819ffa5f22e75dc09 SHA-1: d1f41f70c3953bc9e1812f2bbfa681d60b938f06 SHA-256: bacd92f1de2d397507617430dd9b0c057f46e410d5db10642b2b96c4f156bc69
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a tactic to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or content-luring attack, likely delivered as a spearphishing attachment.

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://vilenefex.ru/award?keyword=religious+tourism+pdf
    • https://cdn.sqhk.co/mugegiduveb/46ihWfV/twister_game_font.pdf
    • https://cdn.sqhk.co/xemugugafot/zlWjePq/sticker_maker_make_personal_stickers_apk.pdf
    • https://cdn.sqhk.co/kupovite/e0hjfbM/ninokevokogudujoborogu.pdf
    • https://cdn.sqhk.co/geroterunetu/iflPjiX/stickman_warriors_dragon_legend_super_battle_fight.pdf
    • https://cdn.sqhk.co/pisapaxosabo/cppih7O/72777237917.pdf
    • https://cdn.sqhk.co/zezetemirag/bggjhif/bogufefizaraliz.pdf
    • https://cdn.sqhk.co/pozusonitid/sh3Rvia/kpop_boy_bands_list.pdf
    • http://zotoxilob.getenjoyment.net/davipotave.pdf
    • https://cdn.sqhk.co/fularulojoze/PkjfGgg/mini_game_consoles_built-_in_620.pdf
    • https://cdn.sqhk.co/divojimo/ifiadr6/xoropawanuloxujadumupis.pdf
    • https://cdn.sqhk.co/sifilefu/dHUnpgd/66858580283.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wanasuvedigo/28854230074.pdf
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_1f98da9eb67747aea329a8265213a73d.pdf?index=true
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_dfe3274d3ba34ef6869713167b1cbb64.pdf?index=true
    • https://s3.amazonaws.com/zifozujiwi/what_does_cbt_do_for_anxiety.pdf
    • https://s3.amazonaws.com/defujo/car_racing_android_game_phoneky.pdf
    • http://malejubu.myartsonline.com/pojud.pdf
    • http://palelezugob.onlinewebshop.net/estudios_biblicos_para_la_vida.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc3.bin
a7ba5af7caca7d24f85ec62ce131d60632015ad8866e3fd5bb0f714c5d0ad616		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 3712 bytes
font_01_sfnt_off00010ac5.bin
201c930913b227973beefef8aa5c18fe98329e895f726397fefef383f10f1795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 4936 bytes
font_02_sfnt_off00011ba0.bin
682de772427524740ca70c338adcb59d9a713a8bc087729f123bce940245f365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 11248 bytes
font_03_sfnt_off00014161.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14161 4324 bytes

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