Malicious PDF — malware analysis report

Static analysis result for SHA-256 338ec05697df3e63…

MALICIOUS

PDF

74.5 KB Created: 2021-02-28 19:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ad157b3a380ab242dd328cd6b9bda26 SHA-1: 1e99ab458ed5414af34f654ff5012c582a1118b3 SHA-256: 338ec05697df3e63d29ab31a1f3da708b8616885282e723e2923d9d0868df49f
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute traffic to potentially malicious sites. The presence of a search term related to Netgear password resets indicates a phishing or credential harvesting attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/123?utm_term=netgear+prosafe+switch+reset+password
    • https://garegijewavib.weebly.com/uploads/1/3/4/3/134389285/a14a77fa4a7.pdf
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/77ec9c1d2f4a751.pdf
    • http://kudukudimox.sportsontheweb.net/who_was_the_sexiest_man_alive_2018.pdf
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/8233d52bfd.pdf
    • http://lololoj.sportsontheweb.net/xisebonofugidema.pdf
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/ruwavesuzij.pdf
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/zemepiwa_kavemu_lexogogefesor_derilimikima.pdf
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/wirirutuf-datipep-momatifi-ganovaboxin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mawokale.myartsonline.com/identifying_similar_triangles_worksheet.pdf
    • http://wokarodefi.onlinewebshop.net/33209812871.pdf
    • http://vujuvisesakok.myartsonline.com/57536870126.pdf
    • http://wutejaxevewef.myartsonline.com/navy_advancement_exam_dates_2021.pdf
    • http://nolepukopele.epizy.com/vajukevagekanajukokuz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e535.bin
ac3a8e3d3d0f79091473ef7a8595a9efea67176c4f07ef5c202f26c1e2aeb2aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 5448 bytes
font_01_sfnt_off0000f7d1.bin
00b55bbc87522681493b4d03d334812ce6289125fb85f73c356c9d524d870481		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 11004 bytes

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