Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e635bf665e89e0…

MALICIOUS

PDF

69.4 KB Created: 2020-11-20 03:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6f71a0ae75ef0010cf152f0beb873f90 SHA-1: 1ddfa04bcbfd3f56e38b718b59ed85dba2801b4f SHA-256: 28e635bf665e89e0f6454aed22cc88fc8303d8e93928917222f5c8f0038b8415
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains a lure related to 'Scottish school holidays 2017/18' and an embedded link. Heuristics indicate this is an SEO redirector link used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=scottish+school+holidays+2017%252F18 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5f99b8ae1f99a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_5fb3ed8a8e871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5fa03c2e77211.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/tunenijexe/roblox_free_games_without_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/90067092234.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/jazijalegosedel.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/57300620453.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/canton_swap_meets_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/900_ford_tractor_manuals_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/wirulekafituganen.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/97477646135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5fa611d-4424-4315-a6ab-4a9f596be023/vixopujufarupelufo.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/58153395579.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/76730962991.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 3

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_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 5772 bytes
SHA-256: d105611b020e2df21b5647cd2380b8113acf5e635c94982a3b69ab9272c7120d
font_01_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 9940 bytes
SHA-256: 8f41c8ecfe3d948209cb536368732e525b0f8402386098243fe9f86f6c96fa7e

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