Malicious PDF — malware analysis report

Static analysis result for SHA-256 98de684b969629e7…

MALICIOUS

PDF

71.2 KB Created: 2021-02-19 21:29:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fb47f3fbcceb343b2d3ebdf08ab8a8bf SHA-1: d72e87ec7dd7040d20b2378bb9c9f7bc3f937410 SHA-256: 98de684b969629e7166c00d0238c6706f86ddde5e34c13782974e5ed10591a53
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=kenmore+dishwasher+model+665+filter+location PDF link annotation
    • https://fikuzafunowu.weebly.com/uploads/1/3/1/8/131857523/48120111b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_600e14b1a5e8a.pdfIn PDF document text
    • https://wimupajano.weebly.com/uploads/1/3/4/6/134682998/3048594.pdfIn PDF document text
    • https://fazerirusabutef.weebly.com/uploads/1/3/1/3/131381144/03c96383ba9b.pdfIn PDF document text
    • https://zotadapavera.weebly.com/uploads/1/3/4/4/134483721/2b9da8.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/hoifiiC/redream_premium_download_apk.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/f63b016.pdfIn PDF document text
    • https://duzopuxezofuj.weebly.com/uploads/1/3/1/3/131382696/c477b8e2.pdfIn PDF document text
    • https://titanukudolilip.weebly.com/uploads/1/3/6/0/136082060/rusemujiduzeve.pdfIn PDF document text
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/pererelaruke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477637/normal_5ff664d656d54.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/eSohgLq/snapseed_photo_editing.pdfIn PDF document text
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/3173848.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/rozejuwapuneziku.pdfIn PDF document text
    • http://maliwalilaz.22web.org/ramelinafiketowusanud.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/bghhaie/5408356534.pdfIn PDF document text
    • https://fedobakeruja.weebly.com/uploads/1/3/4/3/134367732/1e5161.pdfIn PDF document text
    • http://domexogod.22web.org/guzimikegamametenimurul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_6028b49d61d68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5fdf5b8237aac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tirejazanapo.epizy.com/how_to_calculate_manpower_requirement_in_construction_excel.pdfIn PDF document text
    • http://folezazav.epizy.com/eye_wash_station_sign_off_sheet.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 5600 bytes
SHA-256: 50e92e34596203c260407e99d33292242e021097030839b86e3c7f6c71a3eb4c
font_01_sfnt_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 9884 bytes
SHA-256: 80c21fe704fb75f0b52445e635662175fc31453d0c66071ce8fc5b30af0918a2