Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6913a7117438c76…

MALICIOUS

PDF

68.9 KB Created: 2020-11-25 00:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5ae0315fd327e06518f297e123cf502f SHA-1: 69fc6cefc866f5f4bf2b6d5f41a123dcb4e59eb4 SHA-256: e6913a7117438c768163c6fa34f8433931d6dd621630949c660b54f989537d4b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on disposable domains, forming a link farm. One of these links redirects to a known malicious infrastructure, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the link farm point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=php+empty+array+values In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_5fbc15443f7cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5f97c67223110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5fb8a68e0227f.pdfIn PDF document text
    • https://ziwirekow.weebly.com/uploads/1/3/4/5/134529616/3142691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5f8bd03fc87a6.pdfIn PDF document text
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/8249673.pdfIn PDF document text
    • https://baxinumep.weebly.com/uploads/1/3/4/3/134366260/xakugawomata.pdfIn PDF document text
    • https://mokitigek.weebly.com/uploads/1/3/1/6/131606839/220a530526ffe.pdfIn PDF document text
    • https://padabomax.weebly.com/uploads/1/3/4/6/134681696/cb6cd02952f.pdfIn PDF document text
    • https://direnebem.weebly.com/uploads/1/3/4/6/134641367/b2b8a651413.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/373225.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/fbb42cf1-a2dd-4ae7-b48c-5aa9738f207a/80911616773.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A5 4840 bytes
SHA-256: 32ef10603922e94138bd561a0b370585507e2ce03c32d2063d55ed459b6c7984
font_01_sfnt_off0000d117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 11972 bytes
SHA-256: 19427df39a73c8c2aa2bac83fae1de6bea40bd79e598376c38e95738f76214d0
font_02_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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