Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79e9d3cb563e792…

MALICIOUS

PDF

65.2 KB Created: 2021-02-23 08:18:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 718a8bc3af4e972b15411fd2daac622a SHA-1: b73a153aad103f9e387f841fdb0d7f52d591823f SHA-256: c79e9d3cb563e7920dd872d69f8fa5cf6c90c9f0ad807394e1d55769f4aa7093
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains and link farms, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://bologen.ru/wix?keyword=cantos+de+perdon+a+dios PDF link annotation
    • https://zonidazoledod.weebly.com/uploads/1/3/1/0/131070441/faxuferufabinide.pdfIn PDF document text
    • https://vorapitejure.weebly.com/uploads/1/3/4/6/134605364/4b8e8beca8aa7.pdfIn PDF document text
    • http://free-at.pro/the_room_movie_2015v4r26.pdfIn PDF document text
    • http://pe50off.info/methodologie_de_l_argumentationbcrmc.pdfIn PDF document text
    • http://youralteragoods.com/57374961169jcc6q.pdfIn PDF document text
    • http://ourfanz.com/bezapebenciujc.pdfIn PDF document text
    • http://ttttrrrr.space/names_and_formulas_of_binary_covalent_compounds_worksheet_answer_keymo95l.pdfIn PDF document text
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/nexirusutabo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikawojesagoso.rf.gd/fopiviw.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/xuxuwididiga.pdfIn PDF document text
    • http://mijikabetabup.rf.gd/the_road_less_traveled_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/70486900369.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/convince_me_meme_template.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_off0000c2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A2 4828 bytes
SHA-256: 1dfc4ad7066e303209f19c852792715bee93ecd4aff988dbc31bc7e863b65479
font_01_sfnt_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 10952 bytes
SHA-256: 6e306fd12bd0e765e9f79ce1166fd13911de6fa769e0d7e5049786b6dfba829e

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