Malicious PDF — malware analysis report

Static analysis result for SHA-256 922542639c6102ee…

MALICIOUS

PDF

86.2 KB Created: 2021-02-21 21:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0334883fe24562d703ad01bdac4b0448 SHA-1: b19021abdcc63f0c1831d73d4b97dd4039340283 SHA-256: 922542639c6102ee9922be8a1c0b55ee15d51d5dd21e4049a9ec38047e56f343
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains a large number of embedded URLs pointing to various PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The presence of a critical heuristic for malicious redirector links and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were extracted, the structure and URL distribution are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=complete+physics+for+cambridge+igcse+workbook+answers+pdf In PDF document text
    • http://naturalik.fun/download_extreme_car_stunts_3d_mod_apkh1hkb.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/Pjhxhf3/gupedajovogokazibopujip.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/jgfJwia/free_music_for_youtube_videos_download.pdfIn PDF document text
    • https://dosabaret.weebly.com/uploads/1/3/4/8/134861273/roxuvezub.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/hcVOjcg/naxipogerewikuridowos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_600add99b5706.pdfIn PDF document text
    • https://zisidolig.weebly.com/uploads/1/3/1/3/131379992/mowajul_winuloru_pevomew.pdfIn PDF document text
    • https://gugozakeku.weebly.com/uploads/1/3/4/5/134588211/labubirukegimekit.pdfIn PDF document text
    • https://cdn.sqhk.co/lojenozasila/bjjhche/tigopetazepit.pdfIn PDF document text
    • http://mif-smeh.space/gokoja2j1eg.pdfIn PDF document text
    • https://cdn.sqhk.co/puberufibo/gg8LidU/80433648818.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/SDGKfib/contracts_finder_threshold.pdfIn PDF document text
    • http://save50.pro/tenuxizorozomifw9d.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/ibhjiaT/spacex_crew_dragon_demo_2_launch_date.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/dzheheQ/superhero_fighting_game_ps4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/corona_renderer_tutorial_3ds_max.pdfIn 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_off00010ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC4 5872 bytes
SHA-256: 02b4299d4a75f3d948872446aec8ce7c3f4a3a7a1cb20b2dad114aaa0ce93c95
font_01_sfnt_off000122ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 12192 bytes
SHA-256: a402bbc3d910c1c50412d220dedf5cc30d288c7b3b29667db587b50656c1565a

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