Malicious PDF — malware analysis report

Static analysis result for SHA-256 745a4f7eb739f412…

MALICIOUS

PDF

95.0 KB Created: 2021-05-08 10:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b61fe12aa19f89d297cdae15f607d760 SHA-1: 535b16b330b7be29d784b85ae15562b59377a92a SHA-256: 745a4f7eb739f412288520d276552fd9269ac1631850207ff55feb46ab9cc262
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with a primary external URI pointing to a URL that appears to be a phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious content delivery mechanism.

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://jottigo.ru/strik?utm_term=cognitive+behavioral+therapy+books+for+anxiety
    • https://cdn.sqhk.co/gizoxemovefi/p5ghjjY/movie_matrix_trailer.pdf
    • https://cdn.sqhk.co/kinanekoxo/XNgd8hh/new_messenger_2020_apk_no_ads.pdf
    • https://cdn.sqhk.co/wufevinek/hdgi7ed/power_media_player_has_no_sound.pdf
    • https://cdn.sqhk.co/sonorizeluwi/6jjhiia/sahoo_movie_telugu_songs_free.pdf
    • http://fasoxuxesatilu.sportsontheweb.net/wewabexux.pdf
    • http://xonitaj.mywebcommunity.org/kolkata_map_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4499995/normal_5fda1c295d702.pdf
    • https://cdn-cms.f-static.net/uploads/4393349/normal_6012a15b48c9c.pdf
    • https://cdn.sqhk.co/nipigagavadu/9WZ6idv/kitiradetevegoxufuzawemod.pdf
    • https://static.s123-cdn-static.com/uploads/4485689/normal_5fec93951d28e.pdf
    • http://kalidejomepajo.scienceontheweb.net/11180853564.pdf
    • https://cdn.sqhk.co/vojofarakiva/BOBViiV/52714965705.pdf
    • https://cdn.sqhk.co/posiraki/arhawLj/27722761396.pdf
    • http://xapiduxirob.mywebcommunity.org/vujimevopetodudulexipugak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voropa/what_is_the_current_nec_code.pdf
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_f6212ce3a3db41488bc86727b4a9b790.pdf?index=true
    • https://s3.amazonaws.com/navoburarovada/gozasomejove.pdf
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_c6edd641df7d4b5fa8f126e651a0a5e5.pdf?index=true
    • https://s3.amazonaws.com/legesiliv/budget_2019-_20_summary.pdf
    • https://s3.amazonaws.com/tobito/46764814700.pdf
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_28d2574cc7d749bca0227a38fc2c19bc.pdf?index=true
    • https://s3.amazonaws.com/mokuwanibof/plantronics_backbeat_fit_3200_price_in_india.pdf
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_f9dd1c7fd7244672b52f3a05131fc5cb.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_off00013513.bin
2e5233f7f3099b4d9561bdb7d8d69b10a4f9f6d755e73813e4d61cb3fb88d0c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 5504 bytes
font_01_sfnt_off000147d2.bin
d58d0f6b697df2af615da5278779d8e3ed6b61c7e2b885924ce21d80fa2e8619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147D2 11312 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.