Malicious PDF — malware analysis report

Static analysis result for SHA-256 8890dedffa91dd9c…

MALICIOUS

PDF

90.7 KB Created: 2021-03-24 11:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 944b8707edd6200b827384107f79e7d4 SHA-1: 40a8294f16676fcab7332f4845416a715f83a5d7 SHA-256: 8890dedffa91dd9c8257a8f9fe33e887fa0e368ba4d7e5c3f2a6c8c33a2556d6
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs and the PDF structure indicate a potential for redirecting users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=lg+ductless+split+reviews PDF link annotation
    • http://kovamuwaropepu.getenjoyment.net/case_files_surgery_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/ieFjfnX/vtech_kid_connect_phone.pdfIn PDF document text
    • https://bununijadepijag.weebly.com/uploads/1/3/5/2/135298825/3365591.pdfIn PDF document text
    • https://fulodovujigiw.weebly.com/uploads/1/3/4/0/134016909/jojakezof.pdfIn PDF document text
    • https://cdn.sqhk.co/tamikoveken/gcgepib/live_video_call_app_download.pdfIn PDF document text
    • https://jebezefekoju.weebly.com/uploads/1/3/4/7/134737834/286ac1a260.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/b5af55c7b.pdfIn PDF document text
    • http://vozobatenaw.mywebcommunity.org/84061199932.pdfIn PDF document text
    • https://surumovosutimu.weebly.com/uploads/1/3/4/7/134733284/42a3c223fe960a.pdfIn PDF document text
    • https://jaxufeloz.weebly.com/uploads/1/3/4/0/134013101/73e2b591ae.pdfIn PDF document text
    • http://nugawijuxuv.mywebcommunity.org/henri_cartier_bresson_the_decisive_moment_download.pdfIn PDF document text
    • https://momobalujinas.weebly.com/uploads/1/3/2/3/132303205/65327.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/dkDhd7S/wevibovujeletagamumuketeb.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/52179411471.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/he6hhje/geketixekirojadunog.pdfIn PDF document text
    • https://tuwopabawebude.weebly.com/uploads/1/3/1/3/131382790/nakolop_zejototiduputa_xajabedimomeji_nizujinoneb.pdfIn PDF document text
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/7560895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_4e741e05ff7043e588ffbdac34c1cedd.pdf?index=trueIn PDF document text
    • http://sugamane.onlinewebshop.net/ludup.pdfIn PDF document text
    • http://wosotufozutula.epizy.com/can_a_diabetic_eat_triscuit_crackers.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_33c489a46dda4376b53b242d6df8376b.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_d3c2ed624c0d4b08a5417570f2cb71e0.pdf?index=trueIn PDF document text
    • http://duzifamu.epizy.com/17662643699.pdfIn PDF document text
    • http://tifureboriva.epizy.com/certificate_of_origin_form_b255.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_53d810def9a24221bb44eafa39b74ec4.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_off000125ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CA 5124 bytes
SHA-256: 8e5d18b9851d676d68c6305b0c63e24fff0756ebf5e86ae8b926bc5a1bf0d442
font_01_sfnt_off00013766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13766 11096 bytes
SHA-256: 0cb7e9d0cf325c2cda110790e3cbb876fa9349694f74b8fd0f41961ef7dde97c