Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f54e3208bc076a…

MALICIOUS

PDF

67.7 KB Created: 2020-11-09 18:29:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 54e920bcda4cc482395a76fc478dc7e7 SHA-1: eb78fdeae76230a9012d7c8ef7633d5408bc78e9 SHA-256: 88f54e3208bc076a8ba63443a21942e09d3da0dc7b809845f8e35ccbcd63b7fb
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution attempt. It contains numerous external links, with a primary focus on directing users to 'trafffe.ru' and 'cdn-cms.f-static.net', suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafffe.ru/123?keyword=printable+alphabet+sheets+in+cursive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417999/normal_5f9ee73aaba94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_5fa92bf0e85ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5f8f25d4913a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8f4d8e47d94.pdfIn PDF document text
    • https://wazuwivanesigov.weebly.com/uploads/1/3/4/4/134431766/c541f1b6b915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/penale/big_brother_albania_2.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/59870887806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a466374-54a7-42e4-9b26-aaadc52263a6/affidavit_of_residency_nevada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e7861b-6419-41c0-833e-02e4bbd60731/lovalowun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0065e8-387f-4be5-91d1-b83fa4daafcf/beziluza.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/13061722856.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_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 5220 bytes
SHA-256: 981844c30beaea5d4d692933199dd0a152ac5b1145e0008f247acc332fefb0af
font_01_sfnt_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 11372 bytes
SHA-256: f0e57607573f6d3ad658e464d16b2aa2555ea8365df836b6dd672e2b17e6c6d1

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