Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c5fc48f0050d2f…

MALICIOUS

PDF

79.8 KB Created: 2021-03-13 18:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 84d2e555024233bdb15f0bd7711e7c29 SHA-1: 1048524cabd1005772067682897b1744ae935cfb SHA-256: 43c5fc48f0050d2f71f4630916c189e5a3ff154c656bb79ea9ee661a316434da
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high heuristic flagging it as a link farm on disposable hosting. One prominent URL, 'https://golowaki.ru/strik?utm_term=where+is+power+steering+fluid+located+on+vauxhall+meriva', suggests a lure related to car maintenance. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/strik?utm_term=where+is+power+steering+fluid+located+on+vauxhall+meriva PDF link annotation
    • http://rapoxarawiwalo.sportsontheweb.net/paradise_lost_book_10.pdfIn PDF document text
    • https://tesujirigagorin.weebly.com/uploads/1/3/4/8/134869290/0a8545d15c48b.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/oxford_american_history_book_series.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/how_to_check_if_im_registered_voter_uk.pdfIn PDF document text
    • http://dekoriribazovax.mywebcommunity.org/94840476238.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/69635833424.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/fifty_shades_of_grey_moviescounter_download.pdfIn PDF document text
    • https://jelalepoxona.weebly.com/uploads/1/3/4/9/134901657/jojedalojafepukazup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15c59e0-f8dd-4bad-ad31-dadcacbd2422/pafetejexolemazogan.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/do_any_rivers_in_the_us_flow_north.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/22669890303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c33a118-1a6a-457e-bec2-c41f9eeaa806/i_am_a_church_member_study_guide.pdfIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_f03e35827403447d8d4ae8e716814c8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nakevoja/aaa_logo_crack_3._10_free.pdfIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_46367ae8cb9f478abd21b636ef7f6859.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vigevot/68527947239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b2c19c-a1c2-4640-9072-26944b6535f2/the_vampire_diaries_gift_shop_covington_ga.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/4568445500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2b99e9-26fe-46ad-a3bb-c98b1c6ba795/70294875930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4fc676-6d21-41a0-94f3-f171c7620820/how_do_you_replace_an_anode_rod_in_a_water_heater.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_bf7643a1898e4e13b8331f7c1dd20ed9.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_874316e2ad50435da5870484beac8f9c.pdf?index=trueIn PDF document text
    • http://nojikigor.myartsonline.com/basic_molecular_biology_textbook.pdfIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_87e87c566ac044d79741714a8fd8cf3b.pdf?index=trueIn 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_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 5804 bytes
SHA-256: baf618c304fa83d2af31bc4da1221412d171fa9561d3cba7de62dd602f0bb8e4
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 10892 bytes
SHA-256: 398234c28003a47104fae733268bb5fa3af52e36f462e3b73bc4cd020fa188ac