Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fb3a4cb4c551ca…

MALICIOUS

PDF

85.7 KB Created: 2021-03-18 03:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ca4ec62c3b89e6c6e3c948af00fa3d4 SHA-1: 27a549156264855b7e65c4bc36b171dbd09594c9 SHA-256: d2fb3a4cb4c551ca09ffb5a6bc0c6f0979f95f4353a01ae11fd416727344a5ed
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=federici+caliban+and+the+witch+pdf
    • https://cdn.sqhk.co/rizijuwet/d6Cgijf/vobozofinotatiwuko.pdf
    • http://maslovauto.ru/tipo_de_sistemas_operativos_mvilpn2fb.pdf
    • https://cdn.sqhk.co/milujawago/e5UtFib/draw_asl_dictionary.pdf
    • https://cdn.sqhk.co/xunijejozi/hcWjfjj/zozer.pdf
    • https://cdn.sqhk.co/zupodejadofe/hjjahdE/zuxolozuwun.pdf
    • http://milanomoda-italy.website/27433587552mbqhd.pdf
    • https://cdn.sqhk.co/limizolaxa/tgh1ic0/how_to_delete_bug_report_android.pdf
    • https://cdn.sqhk.co/xejadukoxeta/FtjbNGh/99304439392.pdf
    • https://cdn.sqhk.co/mabisurud/A5J1sia/iihf_canada_jersey_2019.pdf
    • http://slampochka.ru/trimble_s6_robotic_total_station_manualnjfwa.pdf
    • https://cdn.sqhk.co/kebokeregim/Uxehbje/devanifik.pdf
    • http://kino-vezde.ru/865051634615npxv.pdf
    • https://cdn.sqhk.co/fosulavale/hbza6ch/wife_bugsy_siegel_daughters.pdf
    • https://cdn.sqhk.co/nobukomorur/iijfKjj/56419702532.pdf
    • https://cdn.sqhk.co/nupozifulija/jgehiXy/9349144372.pdf
    • http://fresh-ita.space/whats_another_word_for_study_hardb2l2u.pdf
    • https://cdn.sqhk.co/xadakede/g4hai75/autocad_2007_for_windows_8._1.pdf
    • http://zespodsvetkoy.site/kirate3ium2.pdf
    • https://cdn.sqhk.co/pefapalotux/ia6hgWa/wajuroruzojik.pdf
    • http://questotzvezd.space/mirudakilivotapreaa4.pdf
    • http://domainlimax.xyz/how_to_charge_cobra_microtalk_walkie_talkiesddtnh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_01b04c46caf14d58a26710434b1030bd.pdf?index=true
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_22bd659e61c141c8821b004b6fd66019.pdf?index=true
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_63a413e278ec400e8dff8c5223924ec6.pdf?index=true
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_0bca91870cd643549806be7528717b41.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_off0001115a.bin
d61dc38ad51ede6a240acd18753a7417719bb9152d4425df992c9cb323a42e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 5252 bytes
font_01_sfnt_off00012342.bin
fa476e675029d151ac7e4ba6414833516db83bac8f7082f4026710040680f4b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 11164 bytes

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