Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13b7faaaebd1d19…

MALICIOUS

PDF

98.3 KB Created: 2021-01-06 07:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 98e4e8cb29d83fb6554c4659c2436343 SHA-1: 7b1005476ac3fd3e4473946caa2db106c982befe SHA-256: c13b7faaaebd1d199f7fefa0bc8fe848a881f377c768fe816a640c969fa2812b
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a lure related to 'Dunelm mattress sheets' and redirects to the URL https://trafffe.ru/aws?utm_term=dunelm+mattress+sheets, which is likely used for credential harvesting. No scripts were extracted, but the PDF structure itself facilitated the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=dunelm+mattress+sheets PDF link annotation
    • https://puwofevu.weebly.com/uploads/1/3/4/8/134862481/9210848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_5fe98c32ba79d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_5fafa66edaa74.pdfIn PDF document text
    • https://nojonepidafajik.weebly.com/uploads/1/3/0/7/130775859/numewedi_buvewos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_5fbf32e103f05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f9d6917873f5.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/c2bebbd4-e1ba-4da3-ae16-260db2fa072b/new_beginnings_milwaukee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9a2823-51aa-41f0-8ef7-0ec8dbf46882/lurixibumisoximexejekig.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/trump_2020_flags_and_banners_and_stickers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6648c8a2-d847-42c6-bcc5-e9870fbd50e2/80510762693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d59d73-d320-49ca-b0df-768cfde00076/sonasudosanezexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f488e8-e1fc-46d6-a168-106133309677/genocide_run_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aaebc33-6668-4a64-b8c7-8c4ff29899e5/32372040061.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_off000144c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C9 4924 bytes
SHA-256: 629337fb42170abed4e7f6b649c81cc45d594255ac4136bec7356b6c1cbdac3c
font_01_sfnt_off0001555a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555A 11560 bytes
SHA-256: 1b903181594ba15bb6851e2602a8f76ae1998c99b51afd1695315cf3d40f519f

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