Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50189edf0696d76…

MALICIOUS

PDF

80.1 KB Created: 2021-04-17 13:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4127067f54cb4cbb59e61bbd2ca18ceb SHA-1: 5694b570cc22d0b4ec480bacbc22fe361b1b3496 SHA-256: d50189edf0696d76efb150317866f79d0010ab24ab7d2b0021aad76e1167a4df
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://fokemale.ru/strik?utm_term=how+to+interpret+a+forest+plot PDF link annotation
    • http://nukogebi.22web.org/application_for_canadian_citizenship_adults_form_cit_0002.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/aieBChb/nostalgia_ice_cream_maker_recipes_peach.pdfIn PDF document text
    • http://kimibifav.22web.org/un_decimetro_cubico_cuantos_centimetros_cubicos_tiene.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/sawijewabob/ibgeLpz/25152935859.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/ijnuqgh/early_bird_landscaping_albany.pdfIn PDF document text
    • http://xazowagef.mypressonline.com/16883746644.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/CwhchcE/dark_quest_2_nintendo_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/mggh0Fp/kingston_soccer_tournament_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/neviwove/58785614057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59dacde4-92f0-4f91-ae0a-06f74ba49847/lightning_thief_book_synopsis.pdfIn PDF document text
    • http://fepobetef.rf.gd/best_slow_cooker_with_stainless_steel_insert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd3c284-184b-42a1-8d30-4e5e7d92f661/gap_baby_girl_holiday_dresses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49e8066-1c76-491c-8a6d-2cffa81c2f47/tabexoxifulazigu.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/guide_michelin_chemin_de_compostelle_vezelay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481eb6ce-01c9-4daa-9bdc-e6164cd8ca8b/kilusowusedifimagaxevute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2651af8d-5e35-4c0e-9dc0-9a0657d31b1d/16385554184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755ba789-5b5b-4028-82e3-3facef568f05/cmd_hack_codes_list.pdfIn PDF document text
    • http://tameladizikep.atwebpages.com/6th_grade_math_book_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed7c753-47f0-4b57-ad5a-9c935344f9fa/16511677762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ceed59-9b10-4e39-b8e7-be1769da0796/74578234063.pdfIn PDF document text
    • http://vorasatijede.rf.gd/alternative_fuels_research_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ce0ce8-9936-45b8-a3fe-a88a68cd97ad/lidiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/59086085302.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://tameladizikep.atwebpages.com/In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 4948 bytes
SHA-256: 552932d0672ad1cb1d96c7ca7b4ffad2c12e32bc31ac73e0af8adc3de0b8298c
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 10844 bytes
SHA-256: 18f19d8814f00a90732196be47c49160da76fb6e1d8a4927c006408a3a172ced