Malicious PDF — malware analysis report

Static analysis result for SHA-256 28735abd90e434d9…

MALICIOUS

PDF

72.2 KB Created: 2020-11-25 19:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 212be41b443ec0e9f14ef3fc091e9259 SHA-1: eb9cb6c377171878291cfa607b10d5b11a239897 SHA-256: 28735abd90e434d916762d7ff6e339860ae329a8aafd7cd559852ac476de413e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=dusty+rhodes+auditor+hamilton+county
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/4130a012120f.pdf
    • https://nidegezepon.weebly.com/uploads/1/3/4/6/134650885/20b599596388.pdf
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f9ae709d01b4.pdf
    • https://kenolafopufa.weebly.com/uploads/1/3/4/5/134528829/5f358b1c1.pdf
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/69df0fc0a9.pdf
    • https://cdn-cms.f-static.net/uploads/4415304/normal_5f94f12594ac8.pdf
    • https://fodexugamo.weebly.com/uploads/1/3/4/8/134851562/321127.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/766a3dd7-3502-4895-9fec-7767c33c5ee1/tegodukatazal.pdf
    • https://uploads.strikinglycdn.com/files/22840f1b-03d7-4910-b650-e29a45212697/xekudopemegujilopibodudo.pdf
    • https://uploads.strikinglycdn.com/files/63a00c19-4c31-4d4c-b50d-f4165e89cc6c/gufegika.pdf
    • https://uploads.strikinglycdn.com/files/5172b0f8-c61f-470e-9201-4ebc7f163783/49856230386.pdf
    • https://uploads.strikinglycdn.com/files/b88d247d-5ed6-4fa0-88dd-4434458a4101/undertale_full_download.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_off0000db2f.bin
7bdbe7463e5e1a2d7d56eb4cf5b072136cd481f4b1ce2f48b580bacf6a50fce8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 5280 bytes
font_01_sfnt_off0000ed00.bin
7916937eebfa13a22d0d6a2d0c4f8288a1a691d989e20bf86a17b2200184e948
pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 11408 bytes