Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fc4fec58816662…

MALICIOUS

PDF

80.1 KB Created: 2021-06-07 18:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dcf23ab5f3eb518c9b78b6a6bc7746b6 SHA-1: aeb49365ab306284c3f0260e3b2502e9fa8d023e SHA-256: 21fc4fec588166628611045119f49d96532758e72b31ac7fa47d764f0a3c3479
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to interact with the command line, a common technique for executing downloaded malware. While no scripts were directly extracted, the presence of external URLs and the nature of the heuristics point towards a downloader or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://cructi.ru/pbw?utm_term=pokemon+alpha+sapphire+randomizer+nuzlocke+poketips PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365546/normal_6015b64d243cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_6025ee9c3563a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4447647/normal_60b5f0fe65ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_600e67a73d004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nukuxim.pbworks.com/f/hmdx_jam_bluetooth_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc19cf9-8b82-49bc-9717-41e0b587008c/bissell_proheat_2x_pet_lift-off_upright_and_portable_carpet_cleaner.pdfIn PDF document text
    • http://gapufipi.pbworks.com/f/programme_dentrainement_musculation_pour_dbutant.pdfIn PDF document text
    • http://lipovosufuk.pbworks.com/w/file/fetch/144789654/7544674760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe638bd-b305-4dad-9a0d-5c09ae0e4870/shadowrun_5_weapon_types.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/minecraft_stone_block_modpack_mod_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba609dc2-cd7d-459e-8b35-e010f6c3cfea/26067670544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9300d378-39ff-4449-8f01-47dbfb81aec1/girl_scout_song_on_my_honor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8240ba-a8fb-40c4-a04f-ed0fbc688a28/zuxejodegepezudogin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a1dc69-6944-4a48-bc31-b523ca14f29e/75485468011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b785c9b1-e506-4315-ad6e-7e28f28a31df/fifusuwovifexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb9ab8f-0fbc-4674-941c-246fe8e6999f/tintin_comics_in_bengali.pdfIn PDF document text
    • http://dobifapig.pbworks.com/f/how_to_make_your_crush_miss_you_online.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144663504/pitado.pdfIn PDF document text
    • http://vosebim.pbworks.com/w/file/fetch/144448575/10350128791.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD835 5312 bytes
SHA-256: d370d6aec092e3dd0039b1504382551c0ba3387d05c8357ebf3c9bc2134cb5fd
font_01_sfnt_off0000ea0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 10404 bytes
SHA-256: 76c107788a202a745d90346097bf5f9928dcbe5dcaa6f27c1071460f8b2063c4
font_02_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 16088 bytes
SHA-256: 7ccd8150e2c48a9748994740f2a0713563e2bc66516285f786c138bc0577823a
font_03_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f