Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25f82a1d3117128…

MALICIOUS

PDF

69.4 KB Created: 2021-01-01 02:48:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 33a9eb03bda9ffdba5e0fc093988738a SHA-1: 6e375a0a5673e2ffd317f8b44d3d741a516ef95b SHA-256: d25f82a1d311712833bf086bb9fbd2503abfe764c0d7437a16263b0390354c5e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is designed for SEO link farming and redirection to malicious sites, specifically identified as a phishing or trojan distribution attempt. The primary malicious URL is traffset.ru, which is presented as a 'free download' lure. While no scripts were directly extracted, the PDF structure and embedded URIs strongly suggest an attempt to redirect the user to a malicious payload or phishing page.

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://traffset.ru/123?utm_term=direct+finance+and+indirect+finance PDF link annotation
    • https://gibelugexafop.weebly.com/uploads/1/3/4/6/134687098/9342139.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/1820857.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/f205e07b-3a80-4dfd-9b48-fb0876a384f0/fit_for_life_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/agenesia_dental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4335cd1-2265-4e76-8757-84a51bddd4f1/nier_project_gestalt.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/rozarebonogatak.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/herpetology_science_olympiad_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/como_hacer_una_introduccion.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/jefinusejukejikigezilab.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/dasutof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d527e26-d41e-4ba9-967a-7809fdbc23e1/save_the_planet_vans.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/movies_online_free_site.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 4

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_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 4804 bytes
SHA-256: 0912efd5778ca598f39a243df0ddb8c8833abfb38512eb7168fb2e293c4d8d9f
font_01_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 10020 bytes
SHA-256: dc94465f57f7e7e04e76fd8fd1df306758aeaa4cf6c98cdd1f4d20adbf769af4

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