Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ff03e553650962…

MALICIOUS

PDF

76.7 KB Created: 2021-03-30 14:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1089bf31dc81d75e4882708938a4aeb5 SHA-1: dcbb58f8f77f59908bf4a8d38288f745c44e6a77 SHA-256: b5ff03e553650962d949bc910471a11b495bb399f2fc624c3aa75f2e43a75d5a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the document's structure point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/award?keyword=biografia+de+baruch+spinoza+pdf
    • https://cdn.sqhk.co/pedidagow/hfgiVGH/26469227905.pdf
    • https://cdn-cms.f-static.net/uploads/4474992/normal_6016e60c9427c.pdf
    • https://cdn-cms.f-static.net/uploads/4387920/normal_60342a54832df.pdf
    • https://dupuzebor.weebly.com/uploads/1/3/4/6/134639309/1ef9c.pdf
    • http://yourbigdick.space/15235113625sufk1.pdf
    • https://cdn.sqhk.co/kukisigafumi/XhecBHw/hungry_shark_world_gameplay_part_1.pdf
    • http://ukranews.site/vozometagimirobomog5n0r2.pdf
    • https://cdn.sqhk.co/fisejadiruw/jijhegc/the_great_candy_run_denver_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4419637/normal_5ff89a7fb3fed.pdf
    • https://vaxejoxumede.weebly.com/uploads/1/3/5/3/135346770/zodurevowewotige.pdf
    • https://cdn.sqhk.co/gabixeme/IgiTQih/60694880995.pdf
    • https://cdn.sqhk.co/nakunadubux/iekjghc/maxafegukiragijogegi.pdf
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/1352566.pdf
    • http://golosa-spasibo.ru/how_long_do_i_need_to_study_for_the_pe_examrviit.pdf
    • http://detonicro.website/tratamiento_del_asma_bronquiallsmx6.pdf
    • https://vozoduxi.weebly.com/uploads/1/3/2/8/132815828/mizopejafigufi-bedilonejegozon-nukujavakeden-rubefopu.pdf
    • https://cdn.sqhk.co/vapezuwe/Mjegcgi/princess_marathon_outfits.pdf
    • https://cdn.sqhk.co/forinabam/0ijbCW1/free_brain_training_apps_2020.pdf
    • https://cdn.sqhk.co/vagewovupug/ORrnQhf/stack_crush_ball_online_game.pdf
    • https://cdn.sqhk.co/jozanafe/Ridhchi/worldsbk_tv_coverage_2019.pdf
    • https://static.s123-cdn-static.com/uploads/4392650/normal_5ff7559dddf5b.pdf
    • https://cdn-cms.f-static.net/uploads/4403141/normal_600fb9183885b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ef92.bin
859788e3853a75cb9fee1c6d75596774a6c12e693edb78fe030b10a90e96855c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 5624 bytes
font_01_sfnt_off000102b6.bin
554001cfcb502dc5eb4915706d4e39c5219789434be7c62ef3c61621edd4545c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 10108 bytes

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