Malicious PDF — malware analysis report

Static analysis result for SHA-256 791ab3b864bb76ed…

MALICIOUS

PDF

66.2 KB Created: 2021-02-20 09:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a2ee146cff3ddef39c0676ae8e1ff6bc SHA-1: 56dd61071158df2e771d2052cb4ee02f0ceb00d2 SHA-256: 791ab3b864bb76ed5e4d8ff66a291c9308e90587d480d00a845469cc4f03a1eb
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a prominent one pointing to 'jottigo.ru'. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

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://jottigo.ru/strik?utm_term=words+that+start+with+kop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389809/normal_601e816be24e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5fc76524cbc22.pdfIn PDF document text
    • http://khareedforosh.com/does_directv_work_with_apple_tvuw1k4.pdfIn PDF document text
    • http://erogan-oficial.site/mozudosonerurumupabi2gxtn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414691/normal_5fde6249cd03d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_602feacc33494.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491433/normal_5ff1d4f0df6f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5ff451dd61e18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426422/normal_5ff3febc3d07e.pdfIn PDF document text
    • http://mugedly.xyz/pdf_math_grade_10_answer_key66djn.pdfIn PDF document text
    • http://natlab.ru/astrill_china_linkiyp28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_60261dee4cb00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_60148a572c665.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/j1Pxhdj/93321065630.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/boxalewijim/causes_of_depression.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/zebas.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/52333418209.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/calling_all_angels_jane_siberry_sheet_music.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_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 5184 bytes
SHA-256: d3e57a43b0a4512ef5f55eb6f81a4c0b2ca0c6a60034862403a1d1ae87bdd232
font_01_sfnt_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 9948 bytes
SHA-256: 44d8215a0390a64872bbe83911f26d34cfecb73b9b640a026d0336169cdbb3f9

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