Malicious PDF — malware analysis report

Static analysis result for SHA-256 737be70f07b326b8…

MALICIOUS

PDF

70.3 KB Created: 2020-11-13 13:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bc27769b009eeae225f53361a3b49226 SHA-1: 278f4e26b8839d3b514f5c7b37fe6c9b7c13ee43 SHA-256: 737be70f07b326b8ae8773f1335b8ec9eb70b6d1f925029f683214f2e45c0ef5
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious redirector, specifically designed for phishing. The embedded URL `https://traffine.ru/strik?utm_term=salarisschalen+rijksoverheid+pdf` is flagged as malicious and part of a phishing lure. The document body, though heavily obfuscated, appears to reference 'Salarisschalen rijksoverheid pdf', reinforcing the phishing pretext.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/strik?utm_term=salarisschalen+rijksoverheid+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5fa44be46c3e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_5faa25bd87215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f8854deba7c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_5fa45c00a994e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_5fa090b78a788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f9f3e06e6979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5fa6da6792c24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5fa29409c9778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_5fad53af75972.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/318d46b0-f902-4f6d-ba9d-33ad591f7162/depof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2e54df-9986-4f34-8a53-e4d0aa3cfdd4/subaru_stickers_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80695ad8-51f1-4262-b9f7-760defd45ef9/getutitezudisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963a411c-7989-45bc-9bf2-83c0cdb65b55/wenixafuxozawesubafadamov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcadad17-bf9e-4e7a-8189-53388745f13f/6390424342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af9b664-be51-42bb-b7c4-242b74b2be12/25078294606.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_off0000d438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 5548 bytes
SHA-256: 3ada3574331a26cb75d9a31c17285cc2d7845353177a837e81e0b5df35e22bdf
font_01_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 11032 bytes
SHA-256: 1785effe14081649b5ed6d9308841644704b14a02944d48d35757c7dda0b7923

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