Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5430066bb7791f…

MALICIOUS

PDF

59.8 KB Created: 2020-11-14 06:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63fde8abf246358540768b0202942518 SHA-1: 1fa0e0876a25bf64551f3a12e02a583a7baeabcd SHA-256: 0b5430066bb7791f2c9da270144f0818b4e18d841cb777ab9aac91336c66c21c
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to manipulate search engine results. The embedded URL `https://trafficel.ru/aws?utm_term=eleanor+rigby+piano+sheet+music+easy` further supports this, presenting a deceptive lure. ClamAV detection as `Pdf.Phishing.Trojan` and ML classification confirm its malicious nature. No scripts were extracted, but the structure suggests a phishing or redirection attempt.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=eleanor+rigby+piano+sheet+music+easy
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f88d643b86f7.pdf
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5f957693045f1.pdf
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f8e7d3e1d5a9.pdf
    • https://gemajoxow.weebly.com/uploads/1/3/4/7/134721961/gakexopiji_wejekomogonudog.pdf
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/5525679.pdf
    • https://cdn-cms.f-static.net/uploads/4407064/normal_5fa121c2cf8c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/12fccd7f-d54b-475b-91cf-1911234aac25/69441847289.pdf
    • https://s3.amazonaws.com/remufuzu/cost_audit_report_of_any_company.pdf
    • https://uploads.strikinglycdn.com/files/242eaf44-a315-4b13-bc95-97b691980ef0/16527255842.pdf
    • https://uploads.strikinglycdn.com/files/0ba43bab-2660-4621-b673-476b97db6a97/97433497372.pdf
    • https://s3.amazonaws.com/bulikowexunepov/tinapang_bangus_recipe.pdf
    • https://s3.amazonaws.com/fukezavazuj/national_social_studies_honor_society_scholar.pdf
    • https://s3.amazonaws.com/tokit/95046747946.pdf
    • https://s3.amazonaws.com/voxulija/sejokojog.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_off0000aaba.bin
1cd213d1a01c0a19648cf1f7432487c4292835f918a8fd57bcc519abf453173d
pdf-font-stream PDF embedded font (sfnt) at offset 0xAABA 5544 bytes
font_01_sfnt_off0000bd73.bin
fc9378e364d862a4e9a44d8bb0f38c53131f3ada5bd43fdaa2bce5312a37648d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD73 10288 bytes