Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4676e601d83904f…

MALICIOUS

PDF

71.5 KB Created: 2020-12-02 17:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 79a9e2e74b53e6bf879f9a436a01f57d SHA-1: b8aa0252ee77615b10d4d0c0777f772d97356072 SHA-256: f4676e601d83904f93c7dcb97277fb9e739ae4436a544893247c99eccbffc879
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL 'https://traffking.ru/aws?utm_term=abdellah+nursing+theory+pdf' is identified as a redirector, likely used for phishing or malware distribution. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffking.ru/aws?utm_term=abdellah+nursing+theory+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4468571/normal_5fbca33702000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5f963258a5dec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529780/normal_5fc6a3e282190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387925/normal_5f9b97d490df1.pdfIn PDF document text
    • https://jopizogado.weebly.com/uploads/1/3/4/3/134317888/595cb50b19bcf96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f91294e6c11c.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/e3d78e6f-3619-4f6e-a808-92b53645a2de/beagle_husky_mix_dogs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5e065147b148042ad212/1606376966823/cid_sony_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/bajaj_finserv_loan_noc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf67503c02f22b9d058756/1606379344518/5094704257.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_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 5532 bytes
SHA-256: ee96bf0d4c629b527f23696cf3771f3ae19f4483650b010d27904cdfcff40f97
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10136 bytes
SHA-256: 7b8e18895a153b32e1927dc6eeef07be9c73d7c9012b35232fed3a7e54f489b6