Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8b41ecb4778955…

MALICIOUS

PDF

77.2 KB Created: 2021-03-09 09:14:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31e3fba7e3d71a6d3f6f0338482fcad5 SHA-1: 9a5a6514fa37095fbc14e05105c758b4a79618af SHA-256: aa8b41ecb47789557c10be9a51157e2894d32edacfc3ee041c1d07e9dd9bbab6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, contains keywords related to a PDF purchase, suggesting a lure to a fraudulent site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=descent+into+avernus+pdf+purchase
    • http://azorocheat5.xyz/76450842241bcmjb.pdf
    • http://fruitslope.online/jacques_vert_dress_size_guide754ya.pdf
    • http://appless.space/short_prayers_of_thanks_to_gode0q10.pdf
    • http://gatowixipeba.mywebcommunity.org/jarogudibilevesuso.pdf
    • http://idealicaitalia-ufficiale.site/bbc_radio_app_freee39gs.pdf
    • http://priz24.site/54362331133ig8f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ladurabazidema.onlinewebshop.net/cd4081bcn_datasheet.pdf
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_c4ea2ddf62d142db8102dc661bd24645.pdf?index=true
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_e89d8814ccd7470aa6c5d23130e56b49.pdf?index=true
    • https://s3.amazonaws.com/visagogijulep/mobodimigemazewefabosux.pdf
    • https://s3.amazonaws.com/vogubivajavofu/libro_escritores_de_la_libertad_gratis.pdf
    • https://s3.amazonaws.com/viboxikuz/graphic_anatomy_atelier_bow_wow.pdf
    • https://s3.amazonaws.com/simujix/41971072207.pdf
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_94038ecb9f5b488fbedd136b99e5374b.pdf?index=true
    • https://s3.amazonaws.com/rizezobabub/invitation_maker_template_free.pdf
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_6576f37a08f04ae3a96cee88425a3e8b.pdf?index=true
    • https://s3.amazonaws.com/jidosatikim/nifumidopapo.pdf
    • https://s3.amazonaws.com/baritexovopa/fibokaxugolukubesi.pdf
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_6ca76863fd704d7ea3bdd6e653fedf88.pdf?index=true
    • https://s3.amazonaws.com/tobaziw/19775222006.pdf
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_e3a06699a3664e9b96c86bc372754325.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_off0000f0bb.bin
5d121d738e795775f89302c56e01f8a9a13592c70fe739a9829a308b7edf9e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 5268 bytes
font_01_sfnt_off000102b4.bin
cf78a087deaca4cb134034dbd3599fe934aece37924efd95beeb0bfb0a231f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 10768 bytes

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