Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd1fc8c84e1b13c…

MALICIOUS

PDF

83.5 KB Created: 2021-04-25 05:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ea707d6b9f17cc041cd398a898d2c513 SHA-1: 8eea862b0a7adf59a153b7b377b01d106ea021a1 SHA-256: ddd1fc8c84e1b13cc57c7fcf6f51d4610191e876aef12e61d4a0435b8cfd2fac
206 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. The document body, though truncated and obfuscated, suggests a lure related to 'network cmd commands list pdf', and the 'SE_REMOTE_SUPPORT_LURE' heuristic indicates it may instruct the user to install remote support tools. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://jottigo.ru/strik?utm_term=network+cmd+commands+list+pdf PDF link annotation
    • https://cdn.sqhk.co/xawodoze/hdCgi8L/dawuretawovawi.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/suxujaba/gbKVif5/oscar_fish_hooks_and_morty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_606918315cbf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367938/normal_5fffe0696ca27.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/lgdYijk/speed_motorcycle_boots_review.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/iB9Erz6/10402410150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_6056b721453ec.pdfIn PDF document text
    • http://moresukko.ru/pejamivegubuxijinokt3f8t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_603d01026e933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403952/normal_605659cf19024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_606dd6d6b0c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456420/normal_60357f7095571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403817/normal_5fe8307e501fd.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/ejcZgg8/yugioh_gx_all_monsters.pdfIn PDF document text
    • http://fb-ig-violation.com/dork_diaries_book_14_reading_levelgtf32.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://debefataxa.rf.gd/gosipuwutebiwirobuzuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a893de-b3e3-4f6a-9eac-86d28da8ced0/setosuravek.pdfIn macro / runtime command snippet
    • http://felubumasosazi.epizy.com/tovad.pdfIn PDF document text
    • http://pasufok.rf.gd/mf_135_parts_diagram.pdfIn PDF document text
    • http://zixupikitudid.epizy.com/sikas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ac98ec-199f-4ad5-877c-e2d368869648/the_missing_season_2_episode_1_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eabdb1a-161c-422c-ba6f-97aa1ec96c5d/how_long_do_trane_hvac_systems_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae2c628-588d-4664-93b4-9f5f68853348/is_mi_body_composition_scale_accurate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656255d3-0a76-479c-b973-943b096b0f64/visual_basic_2010_express_free_download_full_version_with_crack.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://debefataxa.rf.gd/gosipuwutebiwiIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 5212 bytes
SHA-256: dcb6bebc4147b48331cae042742d796d644676a4ef1c8e82cf5bd0947dc0d90f
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 11316 bytes
SHA-256: 44b149b9dd4a9544672c940399ea84707ecfb3769f4f9759d966714a643936d6
font_02_sfnt_off00013232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13232 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3