Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91d559fdb45b9b3…

MALICIOUS

PDF

68.8 KB Created: 2020-11-13 01:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 4b602a1cf3f694712eed6654fcd7ba21 SHA-1: 0aad813813e8d23c6c0358684c69de0386254b36 SHA-256: a91d559fdb45b9b31b7fd6681e163f0a75ae930d73d0596bd7c6ee71441968ad
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffset.ru/123?utm_term=canon+printer+not+responding+mac PDF link annotation
    • https://ravusosu.weebly.com/uploads/1/3/4/5/134589623/203b1b48cabe.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/jefamulobidesuvadub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f87f5b074604.pdfIn PDF document text
    • https://vadulovoke.weebly.com/uploads/1/3/4/3/134338980/9e652d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446030/normal_5fadba412ab74.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/muvojugejoxip/tekexog.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/zopok.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/excel_vba_tutorial_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/6522971927.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/27158172543.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/offering_memorandum_template_real_estate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b8a059-e399-41e0-84b5-c6b963ebee1d/dont_starve_best_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e211e71e-6e45-477d-9861-73610556afd1/76746407850.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_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 5264 bytes
SHA-256: d1960cc7b8d560f5a9c5520e2296251a19bb9efad2fb5ff76fe9ea7f5be046ac
font_01_sfnt_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 11036 bytes
SHA-256: 62ac143fdecb3a88a00ebff8210b34dc3be2a8f4f669cf9773edb8033f0fd0da