Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b52b37b01849eeb…

MALICIOUS

PDF

79.2 KB Created: 2020-12-24 07:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f22a322f296d634eab8836c38e21544f SHA-1: d52060f74f622074322c85e3a5586fda62ca7c49 SHA-256: 5b52b37b01849eebfac444298a98f933bf0e2ad1081f6ee99882303ea57f6619
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a link to known malicious redirector infrastructure and a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL, which likely serves as a gateway to a phishing or malware distribution site.

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://gettraff.ru/strik?utm_term=fill+the+glass+of+cold+water
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5fa3643240256.pdf
    • https://cdn-cms.f-static.net/uploads/4427528/normal_5fa0478836dc3.pdf
    • https://cdn.sqhk.co/ratijojitud/ie5jfFz/52198846482.pdf
    • https://cdn-cms.f-static.net/uploads/4427104/normal_5fa3f2ffc8d74.pdf
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/gexutajadomunu-rasumewunak.pdf
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f8c829f2e82e.pdf
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5fdc1d5cdc84b.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/0cbd7f35736ab.pdf
    • https://cdn-cms.f-static.net/uploads/4505839/normal_5fd788aa15b34.pdf
    • https://cdn-cms.f-static.net/uploads/4410018/normal_5fa33e9a27830.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/00d45ad2-e45b-44a9-b133-c1989c655bf9/alpha_omega_easter_egg_guide_deutsch.pdf
    • https://s3.amazonaws.com/fajeloninesitel/63889996464.pdf
    • https://uploads.strikinglycdn.com/files/23391668-c7b5-4ba6-94b9-b2fc145da16f/45392818500.pdf
    • https://s3.amazonaws.com/megodipewukitoj/65082033451.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_off0000f78d.bin
fa4a09b7dcc0e51b3e5a0084cbd8652005d04ee27a56f0520a01c8fbbbd06928
pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 5332 bytes
font_01_sfnt_off000109bd.bin
e995c3f1c4b2a98b4e7dd322fde7dd9cd003bc0f693cec1d49604bfcde80aadb
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BD 11344 bytes