Malicious PDF — malware analysis report

Static analysis result for SHA-256 1784fef007f61afb…

MALICIOUS

PDF

83.2 KB Created: 2021-02-16 02:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 71f2fd9863f4f520be5e8723d89bc331 SHA-1: ac4a5aeccfd225d7e6e046feea6c7ed361c722b7 SHA-256: 1784fef007f61afb6f7c4c778b9a676ec8b03053d0d421ca355f4a370812faf2
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristics indicate a high density of links, some hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were extracted, the presence of many external links points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/wix?keyword=mpls+traffic+engineering+lab PDF link annotation
    • https://cdn.sqhk.co/foropogajag/CiiH7ND/50556370412.pdfIn PDF document text
    • http://remeik.ru/fortnite_season_10_prestige_challenges_guide27zli.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/X9ziaVY/56056876712.pdfIn PDF document text
    • http://abwaab.su/manowijejazaesrjp.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/ge3heN0/42558888493.pdfIn PDF document text
    • https://redikuvemezu.weebly.com/uploads/1/3/4/8/134872152/fanul.pdfIn PDF document text
    • https://cdn.sqhk.co/mawodoso/e3uUlgi/harbor_pilot_salary_texas.pdfIn PDF document text
    • http://imkl-checker.com/212961553890m25l.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/R53jbgf/carx_drift_racing_online_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hs2gghj/hd_car_wallpapers_for_laptop_windows_8.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/xYRwxih/grand_theft_auto_6_trailer_official.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/7345460.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/zizawafolesakutiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_5fe7a11d2ed99.pdfIn PDF document text
    • http://lavka-karamel.ru/672797172717vggg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 5328 bytes
SHA-256: 5aad04780df155403d3dda00b283dc14bb9af56fa994c6987b568c6619cf166f
font_01_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 16464 bytes
SHA-256: 6d2fd51c7689d3c764123ca6f648ab9cf77cfe351461460fbccb33a8cab56866

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