Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50cc4e980605c6e…

MALICIOUS

PDF

72.8 KB Created: 2021-01-30 13:17:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 41e1c2e9c4148efe15093bd29b9f5d6c SHA-1: d12d31e2cb74e24254375fe2d9f22fda9823ff34 SHA-256: a50cc4e980605c6e2a5989276d5b0edf973b32f7bf65aaf22aeea786f2ddfa89
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=diagram+of+respiratory+system+worksheet In PDF document text
    • http://pivojapigalotu.22web.org/wetexofadotizokedefag.pdfIn PDF document text
    • http://nuxuxavolas.22web.org/cheat_crash_bandicoot_ps1_android.pdfIn PDF document text
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/pebenogupa.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/809effb1.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/8484018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xalolowoko.epizy.com/avatar_full_movie_in_tamil_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/wadadadebomukubonubibuva.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/introduction_to_boundary_element_method.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/beginning_spanish_words_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/vutawatiziwol.pdfIn PDF document text
    • http://zuwarikufaz.epizy.com/django_templateview_get_parameters.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/11710462174.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/67521366169.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/ielts_general_reading_practice_material_with_answers.pdfIn PDF document text
    • http://tedivepi.epizy.com/remavevidopovawamopoke.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_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 5540 bytes
SHA-256: 4d36aa780e10d7ae42213adcfafca95bc22df8e27e9f11d8da54649afff88d4c
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 10456 bytes
SHA-256: 81024b6b3804fadd4bc767c1bbd9fadb7ebb5911514947fa76a8071bc6d16cb8