Malicious PDF — malware analysis report

Static analysis result for SHA-256 842229935186a840…

MALICIOUS

PDF

64.7 KB Created: 2020-12-16 20:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 25f69cfe06a4341d573f28c02959ca5f SHA-1: 7c015e05e1eba63be5ae14b7dd802f0630543b2f SHA-256: 842229935186a8405e19f0bb526e8286d36c3cb368658f01cb7ba157dbca39fa
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure ('traffking.ru'). The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a book title, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=thinking+critically+about+ethical+issues+8th+edition+pdf In PDF document text
    • https://vejurinunabesud.weebly.com/uploads/1/3/4/7/134705678/xoxulepupalakufakozu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480423/normal_5fcb51fc6b359.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/9232432.pdfIn PDF document text
    • https://nenopejir.weebly.com/uploads/1/3/4/6/134603535/jineniludo-zanud-sarugemevezotik-rotider.pdfIn PDF document text
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/4880803.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
    • https://s3.amazonaws.com/tutasujal/antrenmanlarla_geometri_2_zmleri.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51e66c14dfd36fe0cdc92/t/5fd75cf989566e781f6d2bda/1607949563145/anime_couple_hd_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0452b387-1dfe-416b-8f2d-6d72ed177baa/excel_trkiye_haritas_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4dce68-3fc9-4755-8b73-646a7e8b416a/68956610251.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_off0000af0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0F 5748 bytes
SHA-256: c60d959a4af70a751a636051a7935f66a6bd190c15bb0de461254ed06cfd5724
font_01_sfnt_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 10524 bytes
SHA-256: 094d75c44068f95839cd9fd19d1b0b505d9383ccaab11633d25e499bdb857da0
font_02_sfnt_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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