Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c5dc763d1f6b5e…

MALICIOUS

PDF

77.7 KB Created: 2021-04-15 09:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c3808aa168d65052f7f0392ab91fbb7 SHA-1: b39b39ac186178e7d34084dca85f7f26db95d5a9 SHA-256: 27c5dc763d1f6b5ec54d53b4880a81c0510b62ce7782abf363d802e170222ed0
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, with one prominent URL being https://nipisod.ru/strik?utm_term=main+guitar+chords+pdf. The presence of these links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=main+guitar+chords+pdf
    • http://xoroketogejuxe.mywebcommunity.org/longman_dictionary_download_for_mac.pdf
    • http://supariwepexafat.mywebcommunity.org/rewam.pdf
    • http://naligixe.getenjoyment.net/old_macdonald_had_a_farm_book.pdf
    • http://newipufisatag.scienceontheweb.net/cell_biology.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pejenusiloxo.rf.gd/biochemic_tissue_salts.pdf
    • http://zitulogakapede.myartsonline.com/how_can_i_tell_if_my_furnace_has_a_pilot_light.pdf
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_130499a2acf44dd9a570bfebf9019d47.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8984ad00-60a2-48fc-84e2-4436ecc47a25/wazimusukawuf.pdf
    • https://uploads.strikinglycdn.com/files/656b3bb1-7e97-4565-a677-d1643c171bc6/yamaha_kodiak_400_parts_uk.pdf
    • http://milebulijulami.onlinewebshop.net/teboxepoxazuz.pdf
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_cc7286cd19624b25abe9a8e11f34537f.pdf?index=true
    • https://s3.amazonaws.com/jizubisetebof/vidmate_audio_song_app.pdf
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_7d5d2db60c2f411b8ebbadd658ff610e.pdf?index=true
    • https://s3.amazonaws.com/zowibatev/cheetah_bengali_movie_video_song.pdf
    • http://tezadoni.rf.gd/heathens_live_piano_sheet_music.pdf
    • https://s3.amazonaws.com/zuwosil/fitiputuzuxawuzetuvanepad.pdf
    • https://uploads.strikinglycdn.com/files/7ba141be-220f-48c8-911c-220ca0ae4680/everstart_maxx_battery_charger_instructions.pdf
    • https://f766a7e9-a0d0-4e3a-bf7c-946d2e8c2ff4.filesusr.com/ugd/bddb96_b3e8720d83c749a984dba6a88cfc0e35.pdf?index=true
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_b97fd1216b5f427290b4219e56504bc3.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_off0000f2e1.bin
f8806afff617965d263762af2e05213355a7b17f768f4bd798b63323d42c1c2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 5388 bytes
font_01_sfnt_off0001053c.bin
037c55c22794e35a64ab35bc1168a858e9a1304a8ca708e8d3d39768cf57f342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 10868 bytes

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