Malicious PDF — malware analysis report

Static analysis result for SHA-256 168876b7fa293a50…

MALICIOUS

PDF

81.0 KB Created: 2020-11-21 12:19:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 205b2b19a7b6b6d9f422e9f210429542 SHA-1: bd968e4cf0cdb04e518341d8e77e1f2d364a92d0 SHA-256: 168876b7fa293a5096a93df5b9f1a5f4321fbc8cf943cdea82049b9bcedb79a3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to other sites. The embedded URL and the document's apparent content related to medical treatment are likely pretexts to encourage clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?utm_term=epistaxis+en+ni%25C3%25B1os+tratamiento+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f9caa03a9c94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486034/normal_5fb29b148d95c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_5f97eb7560cad.pdfIn PDF document text
    • https://rapokivagifo.weebly.com/uploads/1/3/4/3/134338569/remetifevazod.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/8205782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f8dda52ca8ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_5fa05119246d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f88cd8df4186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_5faecdd743fee.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/dekusirof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_5fa6af9287a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5f961de53fc49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/25bd3cb6-62b4-4185-958c-89f6561a34d2/zinovoteloruxawumex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6cf03ea-1cad-4b6c-ab27-ff35cc22de34/mofimerijikipitexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e692fcca-9d29-4208-a600-f07ba30c344a/45685865098.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 5392 bytes
SHA-256: fd64d44f047e1d10f5adff965693c022cc04db9ac2f03750e1b3de98ae37ee1e
font_01_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 12160 bytes
SHA-256: d3a85429d22bd254b6fef505dd6670ec36346acbc702248ff9583c53bc406442

Open this report in the interactive analyzer, or submit your own file for analysis.