Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd98777b5ba261ab…

MALICIOUS

PDF

78.1 KB Created: 2021-04-16 12:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 185dc40a4e8f0321335e35688ac0559d SHA-1: 2c74a9b3bb360ac0062e2d8e58d899199f7e6bcf SHA-256: cd98777b5ba261ab07b8229fb98db59aaae4c02458fbbc480a2fa80a79b29b7c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://baarspo.ru/strik?utm_term=hp+laserjet+2100+pcl+6+windows+10, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://baarspo.ru/strik?utm_term=hp+laserjet+2100+pcl+6+windows+10 PDF link annotation
    • https://cdn.sqhk.co/lixejudazeza/giicgiE/commander_cody_band_youtube.pdfIn PDF document text
    • http://pukujadud.getenjoyment.net/print_web_page_to_android.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/jiaKeXD/who_moved_my_cheese_video_with_english_subtitles.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/jbBjahb/police_auctions_cars_melbourne.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/xezenurotixut.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/zdStRjj/kumajegapasizarakusifun.pdfIn PDF document text
    • https://cdn.sqhk.co/rumomezojeku/ihNhics/54825922447.pdfIn PDF document text
    • https://cdn.sqhk.co/legesizas/dPjevhg/gagovugoxidoputata.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/Zhdjbid/tubal_ligation_reversal_cost_in_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/Ttdgckj/lomikaj.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/e2geihN/nezubatis.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/fghQgh7/my_pocket_city_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/pFNjijh/my_dream_home_design_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/jdxm3Hl/throne_rush_online.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/38666254459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_e82836dedb4b4d9f990d903b9984928e.pdf?index=trueIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_95f10e8163e14010bd0d06b939857a3e.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_73e0a71ed87d4d8284b42618ecc6f7c4.pdf?index=trueIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_5f646ad395364672bcd25c34d81bb62b.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_8175c90fd93b4ac798527718a40cc5e2.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_ada00bc8c8654c8b9890ef4afa1696b7.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_11f404d8724b41759b5f62ff43ee1c16.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_ee512fccc6174a48aa050092f49be770.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_6e0ca8de6da7445580f40d726277aafd.pdf?index=trueIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_4b40c860fbfe498d9b94d1f987b35bce.pdf?index=trueIn 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_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 5676 bytes
SHA-256: 4c5d1e52941f50c6743243f17245e4bb01359768e75178bdfe37444e15f84be2
font_01_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 10572 bytes
SHA-256: 2b2d33cc7c997fa7689c0df432a9998e665e91c370e247c47fdf0d5bc1ee3148