Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f79dd33902b7f0…

MALICIOUS

PDF

66.8 KB Created: 2020-11-20 20:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b2d76307551a17bd317ae0b490f2dbb SHA-1: 17ed7fc30d4f8393ea0fd1a4612ae6a2e6b45c82 SHA-256: 36f79dd33902b7f02908fca9df669a7e82e87ae79b902ef6e2ade33787e2ff37
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains multiple embedded links, including one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure suggests it's part of a link farm designed to obscure the true destination of the malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=the+town+school+calendar
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5f8d0b4ad2cb9.pdf
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/dulor-wemaroliredoz.pdf
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f890f1e094c5.pdf
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5f94a242944fa.pdf
    • https://cdn-cms.f-static.net/uploads/4481289/normal_5fae5f21e5a2b.pdf
    • https://cdn-cms.f-static.net/uploads/4424007/normal_5f9caf5743018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ae95f9f7-a93e-4e1d-a9dc-02ccb693aff6/84926371328.pdf
    • https://uploads.strikinglycdn.com/files/9cf243c9-7398-4460-8398-68758fd37c58/rufogok.pdf
    • https://s3.amazonaws.com/memul/39169046670.pdf
    • https://uploads.strikinglycdn.com/files/bdada328-eeef-42d6-be6a-48180f35f023/39414010467.pdf
    • https://uploads.strikinglycdn.com/files/73e881ee-357c-4bc7-a66e-088cd4ec8c18/zosakopogokodeguwiseseres.pdf
    • https://s3.amazonaws.com/tometubufimopim/79543157235.pdf
    • https://uploads.strikinglycdn.com/files/9e263a10-5b87-46d1-b8d6-63266968e7cb/29993311536.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca43.bin
742dd0c165c99bb0e93aec3c77d838a85148c75e8214c9551b5b8795fbbd3dec
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 5068 bytes
font_01_sfnt_off0000db8a.bin
38303bfa462aaf33148ab455da540c964e9a9aa92537d538fe99af8697c130c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 10328 bytes