Malicious PDF — malware analysis report

Static analysis result for SHA-256 237d6609338b53b0…

MALICIOUS

PDF

70.6 KB Created: 2021-03-01 17:27:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 0a4ae6efcce7b1ffc584ea746b4b4053 SHA-1: 8c58c39b91e454fdc5503adfa12b03b389fa5cfb SHA-256: 237d6609338b53b0d00d678b67dc43891cc276d6904754f0e4c08386949ebe2a
184 Risk Score

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
  • 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 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://yafferge.ru/123?utm_term=how+to+crochet+a+simple+beanie+for+ladies In PDF document text
    • https://cdn.sqhk.co/nuvexajamu/cigkjab/21943630782.pdfIn PDF document text
    • http://zuwodaxa.iblogger.org/edge_browser_for_windows_7_free.pdfIn PDF document text
    • http://belplitka.ru/195072017816s4q3.pdfIn PDF document text
    • http://tiwirodizefa.iblogger.org/postnatal_depression_assessment_form.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/ewgjhhW/56140032450.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/lebara_recharge_offersvaxma.pdfIn PDF document text
    • http://teaitalis.space/56250396985knlwo.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/RiaZzTC/xirodizitof.pdfIn PDF document text
    • https://cdn.sqhk.co/jilijibimi/hjUhcyz/36536938516.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/dukexajuj/aegon_bouwdepot_formulier.pdfIn PDF document text
    • http://dujisuga.epizy.com/word_formatting_marks.pdfIn PDF document text
    • http://mizuvawilukilel.rf.gd/78156719205.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/kubopubatopiduvux.pdfIn PDF document text
    • http://barirenuvekesup.epizy.com/46528501303.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/93391154840.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_off0000d599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 5588 bytes
SHA-256: 43b4fa9256a931a34e6795c042cb2c755cc5cd344e1ccb9688076d2dc1a65ea2
font_01_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10812 bytes
SHA-256: ff8cb63ce23a237f4c13e60092a2e72587b4836129224f14c795ce4eb1cc180c