Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f750cf484da5f38…

MALICIOUS

PDF

75.4 KB Created: 2021-03-13 13:24:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 247a6e2e7477734ed7d6fb381ecbe834 SHA-1: 2debfa76cbb374e9d777dee0ad0a5d0ea6930b15 SHA-256: 9f750cf484da5f38d198f206bbca41557cd31b0e057dbbdc468e3e32a5c5a8e7
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 0.9997

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=where+can+i+donate+furniture+for+free+pick+up PDF link annotation
    • http://xejopegig.mypressonline.com/81342103135.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/battletech_wiki_marauder.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/how_to_not_be_an_average_guyycmdh.pdfIn PDF document text
    • http://kaboliwup.mypressonline.com/2016_mazda_cx_5_review_uk.pdfIn PDF document text
    • http://frankiearvelo.com/33887424255stm1b.pdfIn macro / runtime command snippet
    • https://binikefesomeb.weebly.com/uploads/1/3/5/3/135386190/fonawepogujufu-kepisoko-wamobudamejibe-fowowotavu.pdfIn PDF document text
    • https://zopojidiluze.weebly.com/uploads/1/3/4/3/134361294/wezonefejunux.pdfIn PDF document text
    • http://polnews.xyz/how_to_find_cash_flow_formulat7e14.pdfIn PDF document text
    • http://mimivamefigupe.sportsontheweb.net/piano_classical_music_free_download.pdfIn PDF document text
    • https://zumonula.weebly.com/uploads/1/3/5/3/135323502/2527e486da3ed3.pdfIn PDF document text
    • http://onlinesos.tech/lezavolagukwrxt.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/how_do_you_program_a_chamberlain_universal_garage_door_openerf86tw.pdfIn PDF document text
    • http://igme.site/qualitative_analysis_of_lipids_lab_report3ba3n.pdfIn PDF document text
    • https://kusuxifitumaka.weebly.com/uploads/1/3/4/5/134593182/1817860.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/tuverif.pdfIn PDF document text
    • http://kaboliwup.mypressonline.com/2016_mazda_cx_5_In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/514b006c-0a46-44af-ad70-ac4c6d2df235/kemudazugasusegosivap.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/339cf916-5c7f-4f16-93f3-05bb45b96575/are_you_smart_enough_to_work_at_google_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0472e0-585b-4ea9-b762-045c5526bc19/86722780811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3fcbe3-fd14-4437-9dcc-1b1d9e3ee463/sifinopidavimixoxuzutixef.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/22._how_many_chickens_would_it_take_to_kill_an_elephant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01df3e40-99e7-4995-8d97-51f9bd12b098/2005_ford_focus_manual_transmission_shift_cable.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 5112 bytes
SHA-256: 5cff7a91afc22e1f55d66e3eb1a820f7ce631e0b7739d332eb02a751ad573a78
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 10552 bytes
SHA-256: dea0bc3bf5f8f04cd5d6f10dcd2167cfe691e702ec608246b1a3cd3df2640cdc