Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e952f5d2b61132…

MALICIOUS

PDF

83.1 KB Created: 2021-01-16 06:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5fa436e473f100a04f64441e2ff21d0b SHA-1: e6c9f17799a44a8d3e7609190052c3ee98ed9aa1 SHA-256: f8e952f5d2b61132e6058048cbf5cfbb95c223f947cfe63daa29cdd2f6be9c87
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL being `https://traffnew.ru/123?utm_term=bible+study+lessons+for+married+couples`. This URL, combined with the heuristic `PDF_SEO_DISPOSABLE_LINK_FARM`, indicates a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffnew.ru/123?utm_term=bible+study+lessons+for+married+couples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382960/normal_5f91b6b66182f.pdfIn PDF document text
    • https://bebujufexuxiki.weebly.com/uploads/1/3/4/6/134624407/b4da7.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/hgwbXEG/avatar_dress_up_game.pdfIn PDF document text
    • https://vepakuwaderim.weebly.com/uploads/1/3/4/6/134699920/1380590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463275/normal_5fa23c69ae254.pdfIn PDF document text
    • https://site-1168486.mozfiles.com/files/1168486/squishy_magic_sweet_boxes.pdfIn PDF document text
    • https://site-1206710.mozfiles.com/files/1206710/green_party_platform_issues.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_5fa7d9942b901.pdfIn PDF document text
    • https://site-1179882.mozfiles.com/files/1179882/65697325373.pdfIn PDF document text
    • https://site-1176253.mozfiles.com/files/1176253/redfin_realty_nh.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/haYpeji/fidaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/pifidaferibajazatofunov.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/aadat_song_ringtone_ninja.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/marian_catholic_tamaqua_address.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/pokemon_tower_defense_3_mystery_gift_codes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 5592 bytes
SHA-256: e15b8895038a48dcb857a01b1c7395e4423e63b4a0ec228169fa2d28a742ab95
font_01_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 11036 bytes
SHA-256: bfc28581ada1babce301b76be05e5f53d7e1db1af8cfc57d2b6ce50316d01fc9