Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9ddcccc9dda90d…

MALICIOUS

PDF

128.9 KB Created: 2021-03-15 07:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 508266d1c701609493deede6391ef1bd SHA-1: 2b5de0483408ef8cfb847056940701c90ffcf5e0 SHA-256: 2b9ddcccc9dda90d8f85c22889affe34a73dad3189adc72bb30bc7502fd3c796
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 pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The primary URL, https://vilenefex.ru/strik, is likely used to deliver a malicious payload or redirect to a phishing page. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=ticker+symbol+list+nse
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/ce7171e24.pdf
    • https://pilolekolaf.weebly.com/uploads/1/3/4/6/134655903/1952232.pdf
    • https://kimakinogi.weebly.com/uploads/1/3/0/7/130775446/3713913.pdf
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/f1374c6ae76e1.pdf
    • https://cdn.sqhk.co/sekigizakeku/dcBhhgh/buxis.pdf
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/vupijalivusexiwob.pdf
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/jokowajeri.pdf
    • https://xexijezukivox.weebly.com/uploads/1/3/0/8/130874296/sixogafawixuval_fapobo_dosuxanujewif.pdf
    • https://junetinovifadi.weebly.com/uploads/1/3/0/9/130968968/dd7f3b9f0820.pdf
    • https://cdn.sqhk.co/rirakibugo/fn3id9S/score_hero_fase_339.pdf
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/9750935.pdf
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/wapije.pdf
    • https://kewivuzakokefi.weebly.com/uploads/1/3/0/7/130775129/renebafunamogez-fopizu-jonumusi-pesofisisasigir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_2291a36e3e3140818cc2bc155ddc3a5d.pdf?index=true
    • https://s3.amazonaws.com/gomakobez/give_the_plural_form_of_handkerchief.pdf
    • https://s3.amazonaws.com/muxegeza/paleo_food_list_printable.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001afbb.bin
2dc3a50add1104bb1809183f7642bfc743e329a5f291beab95b19a45b1450d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFBB 4780 bytes
font_01_sfnt_off0001bfde.bin
0d4d2d78f3bbb57ece0c604863fca0b9fbbe4a1db16193f4b61ff7e4da578897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFDE 11472 bytes
font_02_sfnt_off0001e6e6.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6E6 4324 bytes

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