Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe7bd23fdbf5318…

MALICIOUS

PDF

61.4 KB Created: 2020-11-18 09:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f660054238f7d6b1b4de56ae3f5ebdf SHA-1: 14bab9929d76e83691d5020f44a6d41c1cfe8543 SHA-256: dfe7bd23fdbf53187d7ca7fe0796e18934c80fe00fb566fda871e4f3ca373a82
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating it contains a large number of links to external sites. One of these links points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gettraff.ru/123?utm_term=pioneer+vsx-453+schematic
    • https://cdn-cms.f-static.net/uploads/4388405/normal_5f9b22355f43a.pdf
    • https://cdn-cms.f-static.net/uploads/4411708/normal_5f97039cb6d00.pdf
    • https://cdn-cms.f-static.net/uploads/4408981/normal_5f9e4051ef065.pdf
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f90e80bedfdb.pdf
    • https://kisebuketi.weebly.com/uploads/1/3/4/6/134657705/fegeg.pdf
    • https://katubebadidi.weebly.com/uploads/1/3/4/4/134474785/5852712.pdf
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5fa8e4b8788ed.pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/add8f8094b.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/9247351.pdf
    • https://cdn-cms.f-static.net/uploads/4481527/normal_5fb4ba9be6b41.pdf
    • https://cdn-cms.f-static.net/uploads/4460255/normal_5fa19afc05ea9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a3c06df7-033c-4eef-978f-308033d38f36/telekibunegukirupiku.pdf
    • https://uploads.strikinglycdn.com/files/c151151e-c4f1-465d-9312-c84c06ce3777/modificadores_de_la_oracion.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_off0000b13f.bin
8bfc14409ddf02e9c204af5307d3e29a1cc5bc82c140217e5c05a4bc154d0ca9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB13F 5544 bytes
font_01_sfnt_off0000c40f.bin
93a3ecddc4a2dfa04168c26e3406019d0e2089be54bfb7a9ede06f7bda3aca21
pdf-font-stream PDF embedded font (sfnt) at offset 0xC40F 10864 bytes