Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a7775ee5ae9133…

MALICIOUS

PDF

135.7 KB Created: 2021-03-15 16:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 79ff8eb2a3f0af3f3091e6e38a076baa SHA-1: 22462c1d394e8403aeb0e781233c5db9f1709806 SHA-256: 67a7775ee5ae913326c504015b8fa13b4a511074457409ef50f2f8edab27749d
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, which is characteristic of SEO link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to distribute further malware or lead users to phishing sites. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest a malicious workflow, potentially involving embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=athlean+x+inferno+max+shred+workout+pdf PDF link annotation
    • http://forexgeeks.net/is_the_australian_legal_system_fairgg9d3.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/dohg6YJ/16575056702.pdfIn PDF document text
    • https://cdn.sqhk.co/gerukoso/fxbhiyd/satib.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/P7mjbB5/leap_of_faith_movie_trailer.pdfIn PDF document text
    • http://itclick.info/xosudab4e9og.pdfIn PDF document text
    • http://lasns.fun/69500762291f5vbc.pdfIn PDF document text
    • https://cdn.sqhk.co/bidubuwawi/jhIihe0/mebezoridunuf.pdfIn PDF document text
    • http://twitter-center.com/sekumomjtnz.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/c7hdhiJ/name_generator_fantasy_female.pdfIn PDF document text
    • https://cdn.sqhk.co/sojejinof/EZhhejc/2587253488.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/agiiiie/30489942408.pdfIn PDF document text
    • https://cdn.sqhk.co/wozobifanu/6hgOwqN/72730811346.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/JONn4hj/gezasefoximevijumanipilim.pdfIn PDF document text
    • https://cdn.sqhk.co/lodesejidi/gjyggxS/56302475930.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/gchcjgr/nikusa.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/iiibghC/frog_ninja_spider_superhero_games_gangstar_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/PigWgda/tubemate_video_downloader_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/luieLjb/azioni_netflix_target_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_51377b6dedce4d77bb8642c219dc960d.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_5eb61fe4997e498db78276840979c62a.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_6b0b3dde88ee49939020c65d54b56ada.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_c96d3240402142749a346c1c44c14d17.pdf?index=trueIn PDF document text
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_2d31dd8f50ef43c5a4ce44fb0de1785c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001be21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE21 5496 bytes
SHA-256: ae4bbb81916d85e35c71a5510eb878419b153a93ce1310b8031dcff28c055ca3
font_01_sfnt_off0001d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0C0 12948 bytes
SHA-256: 6fb99d205f0dd224b9500a1695e8aa4231b82d6b54d8f9508c7f62601008a7d0
font_02_sfnt_off0001fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAE4 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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