Malicious PDF — malware analysis report

Static analysis result for SHA-256 423c4932b8ce118a…

MALICIOUS

PDF

71.9 KB Created: 2020-12-21 18:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1284b39fc3ab842756d793e068456918 SHA-1: 24de202b3f62427da3893c4ef2d18820728eaccf SHA-256: 423c4932b8ce118a0fbe5ab0d8d8c52a2be10d4db321277ee22cd83f0ef46e2a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. This suggests a phishing or link-farming campaign designed to lead users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the presence of numerous external links indicates a strong intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/123?utm_term=kincaid+girl+essay In PDF document text
    • https://jekugisolidib.weebly.com/uploads/1/3/4/0/134097103/pizowutafobudetujige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_5fafe5e31e302.pdfIn PDF document text
    • https://zumutunamoja.weebly.com/uploads/1/3/4/5/134588160/d2d431dd218.pdfIn PDF document text
    • https://gokewulifas.weebly.com/uploads/1/3/4/5/134599519/pigabije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_5fb30388b0f0b.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/6afa05be7de83b.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/pisuwuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_5fa99bd6a0e82.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/fonazuzixagizir/63344853162.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/xamuru.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/email_marketing_templates_freepik.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/today_s_jumble_answer_the_gazette.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/20830587078.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_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 5180 bytes
SHA-256: 2e2ee8cab8bc2a2077bd9c0c04dbc9f4d3dcfe893eadb00a6ecbf01192bb42e8
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 10560 bytes
SHA-256: d20046ddee1c16424f69eef40b00b56a9e267ac191ec7371ba26de1069ec3058

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