Malicious PDF — malware analysis report

Static analysis result for SHA-256 476a1b997041c9e1…

MALICIOUS

PDF

60.1 KB Created: 2020-11-22 18:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02c26fb8282d655fc0c516da503591a2 SHA-1: 1bfe5b07a2c050d7868e14de02ad685ec2efd3ee SHA-256: 476a1b997041c9e1c31acdb3b0b33129e1e205929ba9ac872649f81119bd8325
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://traffnew.ru/aws?utm_term=acr+bi+rads+atlas+free
    • https://cdn-cms.f-static.net/uploads/4489054/normal_5fa9a3ed11fe9.pdf
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5fac2d00d3f5b.pdf
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/vabiwejakoza_temakubosepevin.pdf
    • https://sutikarojujo.weebly.com/uploads/1/3/4/3/134343437/d3dd2c.pdf
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f88089920bc4.pdf
    • https://begumilipanup.weebly.com/uploads/1/3/4/6/134617951/dee350c85c.pdf
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/696219.pdf
    • https://cdn-cms.f-static.net/uploads/4411480/normal_5f9fbfbf6d037.pdf
    • https://derejesi.weebly.com/uploads/1/3/4/3/134388634/3980018.pdf
    • https://cdn-cms.f-static.net/uploads/4389084/normal_5f968279deabe.pdf
    • https://cdn-cms.f-static.net/uploads/4388420/normal_5f9818b52fae7.pdf
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5f9aee6389b5b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuforewebub/integral_calculus_by_ak_hazra_download.pdf
    • https://s3.amazonaws.com/lewuli/81652053601.pdf
    • https://s3.amazonaws.com/kuboki/anniyan_tamil_movie_free.pdf
    • https://s3.amazonaws.com/nemafu/dorajifovam.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_off0000af5c.bin
65a1426f3557ef8ca0a09119b131e3eb7b136c516f9ac399b41859be11eebb0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5C 5144 bytes
font_01_sfnt_off0000c0e9.bin
ee7ec8f441b74892d0761c049c38e2295d672a051c56cf6d2e4d6144b3dd4a7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E9 9756 bytes