Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a6ee48799b3997…

MALICIOUS

PDF

66.0 KB Created: 2020-11-24 21:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8b252fd94329f0e820f34b334de1c0d0 SHA-1: 7c8ed8a41f3092cf03079c5182f03173158c4d62 SHA-256: 83a6ee48799b399759c36c49a70e73d8078b4490274e3d60669234125a7a71fe
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to a redirector URL that appears to be part of a phishing or scam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded links and the overall structure suggest an attempt to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=craftsman+ratcheting+wrench+set+flex PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5f8ceeea401b2.pdfIn PDF document text
    • https://gadowawo.weebly.com/uploads/1/3/4/6/134630962/sekidoxudatidedidapi.pdfIn PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/2882556.pdfIn PDF document text
    • https://vosomomoratefuf.weebly.com/uploads/1/3/4/6/134614816/xeloza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_5fa067c98f7d6.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/dd82abe0.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/58993012-23a4-466e-9d5f-dd7c1f6c1a1a/kapepebiwamubofumonifato.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/paint_shop_pro_7_anniversary_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/056a05c6-e2a3-464f-b9e4-9a895fe650d5/penuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0746fbf2-0edd-443e-a58f-259c2d8abd18/mibeketadavadarodifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59695bf5-b2e4-4930-aff6-d34f57a732c2/564781978.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/amari_information_geometry_and_its_applications.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EA 5360 bytes
SHA-256: de3fec74cc1aa8c99790272dd7f9c0597d82cc47ddb71f2b32042725076658d5
font_01_sfnt_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 10724 bytes
SHA-256: 85efd59131c947dc5970027046788d1d26ef61e338af1872c06b217516816a72

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