Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ff59c239627440…

MALICIOUS

PDF

81.0 KB Created: 2021-02-06 00:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 20f4e0c6e396be5fb51eaf74195e51db SHA-1: dc541202ccc8add99d6fec0bf2cf8c98335653cc SHA-256: c4ff59c23962744013d3f551afd2d2ba742418f7a6df52653270fcfdceed2fc0
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics identifying a malicious redirector link and a PDF link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were extracted, the presence of numerous external links suggests an attempt to direct users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://yafferge.ru/wb?keyword=abbyy%20finereader%2011 In PDF document text
    • https://cdn.sqhk.co/bitomasijelo/gcRHjhm/among_us_live_wallpapers_pink.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/d6jhgfO/quiz_logo_game_answers_level_germany_3.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/09953edda26.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/katazevezowetolafabuvun09mea.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/ad26a249b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_600e23537168d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_601da3327e71e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_60160adc08169.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwifudu/afjcWjj/24178609741.pdfIn PDF document text
    • http://yewes.fun/14602984123rje9r.pdfIn PDF document text
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/bolege-zinevumunaso-rebume.pdfIn PDF document text
    • https://tevunuxewime.weebly.com/uploads/1/3/1/4/131452804/2195612.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/xixonu/noun_modifiers_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/78548690692.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/lubel.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/45330808088.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_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 4572 bytes
SHA-256: 9d37fac69c8f004d9869a6173646bcae17f599b3c7192459a64451a608d0a555
font_01_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 11340 bytes
SHA-256: 0e84ed221f438b05c744f6111b5d3775c748602afbf2ab514d92cb8ec13dd05c
font_02_sfnt_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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