Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a046ad5b921702…

MALICIOUS

PDF

68.8 KB Created: 2021-03-25 10:19:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41eef92df07ed734ffa48219c6aee6f2 SHA-1: b092f627f90e40ac9974375c4a24432d085a802c SHA-256: 82a046ad5b9217024e9d8d72e12a988531285b4dad76e838611e407bbf947afe
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one critical heuristic identifying it as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://zajinet.ru/strik?utm_term=speed+queen+dryer+programming+manual
    • https://cdn.sqhk.co/baxoladipezu/jjg6icd/56895080954.pdf
    • https://cdn-cms.f-static.net/uploads/4379369/normal_604494e1ef8a0.pdf
    • https://cdn.sqhk.co/nupozifulija/cI5n0iT/turerigobizudamapitobeje.pdf
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5fe058b72f7cf.pdf
    • https://static.s123-cdn-static.com/uploads/4465149/normal_5fdefbcad97e6.pdf
    • http://zufejexilovexik.22web.org/que_son_los_armonicos_electricos.pdf
    • https://cdn-cms.f-static.net/uploads/4455376/normal_5fdc8c45b375e.pdf
    • https://cdn.sqhk.co/jigekuragige/bLhcpji/81443047698.pdf
    • http://zatawonilar.iblogger.org/punjabi_audio_song_dj.pdf
    • https://cdn-cms.f-static.net/uploads/4472188/normal_602a7aba9aabf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dd9caa8c-7579-493e-8d23-ccb11de787f9/rubatutosapovibetevodos.pdf
    • https://uploads.strikinglycdn.com/files/1cee26b5-c28e-4da5-a441-e09c4b3caad2/honda_pioneer_1000_utv_for_sale_near_me.pdf
    • https://uploads.strikinglycdn.com/files/3d57f4e5-f650-4d39-89d0-fa9bcd644745/christmas_carols_listen_online.pdf
    • http://vilepobafomunow.atwebpages.com/the_wave_2015_full_movie_watch_online.pdf
    • https://uploads.strikinglycdn.com/files/6c708541-d692-4165-876b-6dd3df1b6cb4/is_star_wars_the_jedi_path_canon.pdf
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_3b38a3b80b964811a66b2faae498aa23.pdf?index=true
    • http://zevesijuduma.atwebpages.com/61318496005.pdf
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_ca056e47084e4b1cae8cdfd2bfc13e58.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6d3157e5-8f7f-4543-8ec6-73712d7b2f05/65677740964.pdf
    • 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_off0000ce04.bin
dc1a51d1fd775c5e8f4b194cddeb117a71098216a849e5ddbd690b7ee4d2d238		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 5432 bytes
font_01_sfnt_off0000e064.bin
c7453eb8551794825d9736c344a1ba5dfc1cd1c3c587336f2db36013ae6dbfab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 10604 bytes

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