Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cdc8edbfa702de…

MALICIOUS

PDF

37.0 KB Created: 2020-11-07 04:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 48708ef76232384e4c4aec274c7ab4e3 SHA-1: 99d826cf03604241038135d79c40fe4c75c0cbfd SHA-256: 52cdc8edbfa702dedccd8613e0ada25acca8aac76b14fccec26704936860ed9c
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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?keyword=fda+regulatory+affairs+3rd+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5fa00499ad5a9.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/bopelopiso-wigujuguwupiz-fafoxunesulowo-vufuwirulax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5f970f7f40ff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f9adf2e3eefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_5f9ef2ba3d402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_5f91c8dd1699b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f87d73c688f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5fa0eea00a5d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_5fa5e4d97ea18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5f94f4b6b30b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5f95325509b7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17d8238-f379-4706-9f47-826a752e21c0/anatomi_atlas_trke_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae27aaed-2905-41e7-954c-68d97816032a/taxazumutepanoxulupotoge.pdfIn PDF document text
    • https://vuxogomirus.files.wordpress.com/2020/11/15772358666.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_off0000510f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x510F 5432 bytes
SHA-256: 1f0cf2444994d3767e82522b23e036d2052886784c3d411652321a206cbedda2
font_01_sfnt_off000063a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A8 10468 bytes
SHA-256: cc78d6f91ceaa613fb29c06b55def31b686544bc14f7c2ae407c5230cfbbf951