Malicious PDF — malware analysis report

Static analysis result for SHA-256 799165b5ce146075…

MALICIOUS

PDF

89.6 KB Created: 2021-03-22 16:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fde2426407745dd69868be1b6f3df9a8 SHA-1: 966e0991492c73d4fbccb6ed7370cbbf9379beda SHA-256: 799165b5ce146075bc3ae9cf1bf883fe8b15be8d71ff3fa93aca3285a86ec5a8
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 0.9997

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://pelibifir.ru/strik?utm_term=life+fitness+9500hr+elliptical+assembly PDF link annotation
    • https://pufedoxavode.weebly.com/uploads/1/3/4/6/134613169/b2460d32bef45.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/xekolojux_nupepazedojex.pdfIn PDF document text
    • http://viseburigi.iblogger.org/vuberatowukawufedukeniwa.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/puzebeworet.pdfIn PDF document text
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/mawenebuf-fitozirasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumupeg.rf.gd/breakup_shayari_pic.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/best_pathfinder_character_sheet_app_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64bb30b4-c2ef-4d21-9951-e216185b75dc/12450051549.pdfIn PDF document text
    • http://togujekunigek.rf.gd/ilr_employer_absence_letter_template.pdfIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_1c95947525c848ba87d9425ed2affef6.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_32240338ec9044cd947351f6987368cf.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_ee51ae0facd94bb090a45935a38b454c.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_465882029416422898a5ddfa01b230ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a49654a-22b6-409d-b67d-66d8a78f69fb/lamigan.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_52cef800a1904cfe96ff448527de8fe5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/99468981330.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_ff255933ba904b97a8f4775b57791880.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/024d19ff-4189-49d2-baf9-9bab90097949/how_to_reboot_verizon_ont_box.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_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 5860 bytes
SHA-256: 98251852e562ff204ae29036b3810a61eb3d8f64d00d448d1d356f152fa420be
font_01_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 12760 bytes
SHA-256: 98b3a6ceef974b9c67c27abc7d79dc5076236f7b1e638acb62ecb5824a07877e
font_02_sfnt_off000141ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AE 16096 bytes
SHA-256: 3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca