Malicious PDF — malware analysis report

Static analysis result for SHA-256 12388a411397becb…

MALICIOUS

PDF

72.1 KB Created: 2021-01-15 11:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5523f568a838697dd7e091edbd5396dd SHA-1: dcd460b699419c8169e2af0c4695128e828eae83 SHA-256: 12388a411397becb9269406ddbebc28a4d7c5a7748670b132f549ccf46c3e734
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains and disguised as legitimate PDF files, indicative of a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this is a phishing attempt to trick users into downloading malware disguised as a PDF utility. No scripts were extracted, but the overall structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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
  • 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/123?utm_term=pdf+architect+7+merge+pdfs PDF link annotation
    • https://xezujexowesujol.weebly.com/uploads/1/3/4/5/134502134/fazom.pdfIn PDF document text
    • https://site-1178112.mozfiles.com/files/1178112/71750098791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425760/normal_5f9b0db6ecce3.pdfIn PDF document text
    • https://site-1179301.mozfiles.com/files/1179301/dosamonisifusi.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/robumuduluwise/when_dinosaurs_roamed_america_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/kajofolezuwuravad.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/benapawagonagepos.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/jagumesikijisegegovixesig.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_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 5616 bytes
SHA-256: 8e13e99684ccad627532d3f29591ec36747b06f33b5ab51fe4beb91474330533
font_01_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 10368 bytes
SHA-256: adc5c4ebe4cdba5c98164ca3f0b5dc3e56ffdd7b499b8590c6bc2207b3143bcc

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