Malicious PDF — malware analysis report

Static analysis result for SHA-256 85171190a2022681…

MALICIOUS

PDF

72.4 KB Created: 2020-11-14 01:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d9fa5a59e1a6c60e07be1060883b95d2 SHA-1: da5a986d4108cdf4e567e7350c91c599637e3a02 SHA-256: 85171190a2022681a39d9dd058c8e6a1f682599f1e062ab660a2474337c3effd
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/strik?utm_term=28+day+keto+diet+meal+plan'. Additionally, it features a PDF link farm heuristic, indicating an attempt to generate traffic or distribute content through numerous linked PDFs. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=28+day+keto+diet+meal+plan In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5f8eecd50f522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5fa9722ad0218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403817/normal_5f986a107ce0e.pdfIn PDF document text
    • https://sopakefexije.weebly.com/uploads/1/3/4/3/134398413/tozuxomed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_5fa0eab6e732c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5f89e1465065c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_5fa02c1c60f3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f86f9fd70e61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/30822451-6c18-44c7-b4d2-adf0b4704f49/california_bureau_of_automotive_repair_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/cabinet_ministers_of_india_2019_bengali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0bb682-0e1e-4db9-aa02-b379cb7bbf46/28482417546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df651a9-b747-4cf5-9b12-4a2e2f6a1cbf/21600336357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72647a8-9603-45a9-99b1-dcc2bbe6a49b/nfl_redzone_streaming.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 5016 bytes
SHA-256: 4af5a2429a3f7f63af7b1a223c7cfcf44282c5ba1d0cd52f76afe71869dc9d64
font_01_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 10304 bytes
SHA-256: e8eabb28cfeae857af4625cf1f89db3b58b79749ccfd30684fa624614d91ab00
font_02_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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