Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c80780d212a5c8…

MALICIOUS

PDF

69.4 KB Created: 2020-11-16 19:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 36a29648ac1a216a57e3ad38052d0f16 SHA-1: 39362547bd02bffa336b0d5b894347daf7e6bfcc SHA-256: a3c80780d212a5c8fdd86fb5ef035ad4a8752dcbb6a43954ec63e7e9d1b6c1c6
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://cctraff.ru/wb?keyword=piano%20chord%20book%20pdf%20free In PDF document text
    • https://nuburobu.weebly.com/uploads/1/3/4/6/134633580/281b9.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/fujipu.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/5538137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_5f94894d192e2.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/fosalizuzu/73554138749.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/kilosi.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/86543873072.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/zelda_quest_2_level_2_walkthrough.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/naming_bicyclic_compounds.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/91288450000.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/machine_tool_practices_10th_edition_download.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_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 5236 bytes
SHA-256: 0ef0e68403da9553ff5e8841106cff653d08b31e15d5095afb6125de5a430fd8
font_01_sfnt_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 10276 bytes
SHA-256: 825151f55f43aee47ebdd29ab53ff8090efdaa391a415802ef6e54568db86480