Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39d8c34a193996b…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 17:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 35a73de88a7234e9e6c01742c97dec51 SHA-1: ffc670567a06d4c239348c05fde15dfb326c7f72 SHA-256: c39d8c34a193996bbd6e84ab904cb3d894ca6836e911204b1375d2b14ce5dd0d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://crophysi.ru/strik?utm_term=d%2526d+dm+guide+5e+pdf In PDF document text
    • http://retamos.mygamesonline.org/books_like_profiles_in_courage.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/DhfTKii/venus_flytrap_facts_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491164/normal_600d60d34f6e9.pdfIn PDF document text
    • https://misetibu.weebly.com/uploads/1/3/1/4/131438078/2777459.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/marley_and_me_book_characters.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/68872831021.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/ejgtghl/kepopapizexo.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/cjbhdgi/jump_shot_modern_warfare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494430/normal_5ffe0a913f352.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/texebenovawidizuvorigok.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/ij8jcYu/pararebuzegevanezuk.pdfIn PDF document text
    • http://zokasup.22web.org/moteditixupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413987/normal_5fdfb1818c368.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/gavapozalilup/zugilejeza.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/voliwaxeluwu.pdfIn PDF document text
    • http://jujovotusenugo.epizy.com/82486807329.pdfIn PDF document text
    • http://dekefolujif.epizy.com/apply_update_from_adb_android_system_recovery.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_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 4156 bytes
SHA-256: 58eabb24298f18ab3cb5c3f3a5652a185830994b36fd37cd9ad46fcf77495092
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10488 bytes
SHA-256: c8f4c0801af869cbe837800a7e15fcc0282890f7db917e60d1338ebfce3e92e1

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