Malicious PDF — malware analysis report

Static analysis result for SHA-256 c163e9a45ba4c649…

MALICIOUS

PDF

103.1 KB Created: 2021-06-15 09:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ff424d533729839acff5f83a999e8e53 SHA-1: a13284e98b5abb49164b20d9a0ce47afc1f0349f SHA-256: c163e9a45ba4c6499b701af667b0956cd0ade0a5e94a8d0c267ffcee44ec423d
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 0.9988

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
  • 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://archism.ru/pbw?utm_term=raid+fayne+masteries PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413973/normal_6007a1227056c.pdfIn PDF document text
    • https://gakexuguzadeza.weebly.com/uploads/1/3/4/4/134401700/dufuwogosoxonu-kelomubapak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5fe7b40c576fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366027/normal_600253e7697a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465151/normal_60020f05b26c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417122/normal_6008ce2e1acfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_60372a3362187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_6059687c2b287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464874/normal_604da04fc124e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_6024a87e83623.pdfIn PDF document text
    • https://jutasosunefobe.weebly.com/uploads/1/3/4/0/134012390/6453a619f314e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_606ab9085bbae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375352/normal_5fe3af75ceeac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_6059fbd7e78ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_60669653749d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_601fa5bf885d1.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/b1ef1a7a-da4d-46d1-9e32-9a521e598721/bar_menu_templates_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae25bb8-a1dc-4a8a-b149-65eef1e55f2f/zunibubofudux.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144678867/wonaned.pdfIn PDF document text
    • http://zuwuzemoj.pbworks.com/w/file/fetch/144673623/xeruj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef2e0a7-efcf-4b9a-b802-67639da86d28/is_the_galaxy_note_3_still_a_good_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83588fff-1213-446f-8327-be9e2fb5e5d8/nidudubur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2866324-589e-4435-b15d-9121b4d2a00e/ribiketupodu.pdfIn PDF document text
    • http://lumoxag.pbworks.com/w/file/fetch/145192944/among_us_ppt_template_free_download.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 5128 bytes
SHA-256: 5eb3aee695c23205f42d191471ae5f724d388da807421179c15afda89b083556
font_01_sfnt_off00014f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F64 12688 bytes
SHA-256: a4a6f6fdb91dbd36b31431f2c1f28b533fa7bac0e48aa3c76a9f9c8ac0bc0e13
font_02_sfnt_off00017a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A22 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073