Malicious PDF — malware analysis report

Static analysis result for SHA-256 b402199c9e3aea76…

MALICIOUS

PDF

91.6 KB Created: 2021-03-28 23:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 2f415190daee066f8a2feb0165bfb122 SHA-1: f6511f9d5c2f11c9041aab3487144e7e464f23f7 SHA-256: b402199c9e3aea762d0493e830eb60603c9739c95f7cc975e3c98438ad0b9a03
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, https://zajinet.ru/strik?utm_term=computer+programmer+master%2527s+degree+salary, appears to be part of this scheme. No scripts were extracted, but the PDF structure itself is designed to redirect users to numerous external sites.

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://zajinet.ru/strik?utm_term=computer+programmer+master%2527s+degree+salary PDF link annotation
    • http://fibaxoxadomi.sportsontheweb.net/google_sketchup_free_version_mac.pdfIn PDF document text
    • https://kefexogutifega.weebly.com/uploads/1/3/5/3/135309882/9084739.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/kothimbir_vadi_recipe_in_marathi.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/zijil.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/77f5c6b347b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464730/normal_5feffba32c51f.pdfIn PDF document text
    • http://dejepuzalew.mygamesonline.org/wejivopokiwalopivinapof.pdfIn PDF document text
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/5268273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_605f639c6b372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5fd059803ac3d.pdfIn PDF document text
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/dojolijisejololo.pdfIn PDF document text
    • https://dulodegusatoto.weebly.com/uploads/1/3/1/6/131636763/mejegokudoruxex.pdfIn PDF document text
    • https://vixevugipun.weebly.com/uploads/1/3/5/3/135327752/5e0879cbe8c1.pdfIn PDF document text
    • http://lazisirogabidir.mypressonline.com/jokefufuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bonizeza.epizy.com/touka_kirishima_wallpaper_android.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/compare_and_contrast_two_pictures_example.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/62261472171.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/man_hour_calculation_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/43981750650.pdfIn PDF document text
    • http://kadanokadija.epizy.com/4922732671.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 5164 bytes
SHA-256: 923da8f30f67e4a8bf759862dc3269c92faf1d38a9536c6dc165b5cbf9e49fb3
font_01_sfnt_off00012cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEA 10912 bytes
SHA-256: c0de5a3a6aaf96e32da1231936c1d4496bd06ddda987a3f6a7e1d953e60bbcd4
font_02_sfnt_off0001520e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e