Malicious PDF — malware analysis report

Static analysis result for SHA-256 76003d1d51e53bc2…

MALICIOUS

PDF

67.8 KB Created: 2020-11-19 23:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f40ba9f5fee78b543e2b67fbf7acba15 SHA-1: bde5495e7745ad3edeb48d5e4f80bb63142db31f SHA-256: 76003d1d51e53bc20af4ddd9e5c5b121d5d379b17a67e8794163a3a2994b59d5
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of multiple PDF links suggests an attempt to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://gettraff.ru/strik?utm_term=hp+dvdrom+dh40n+ata+device In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f89bf8e52dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5f99b8ae1f99a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5f8c8e4c59676.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/woregonipow-supatiwama-durepapamam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_5f89f1542635f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_5faacec6005bc.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/c212f1e9-8b44-4551-864f-3e7565f50863/5549579330.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/gapidizawir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9a3b45-a54c-4ca1-b63f-e17540fd99b4/oshun_stay_woke.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/lobujareluxutijero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e98d223-0995-4969-b3d4-4a9e2a4c60df/metaberabekogifojeketu.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/android_tv_box_mxq_pro_4k_review.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_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 5356 bytes
SHA-256: 979155f5fde4d72dcb39be8e1abfd1c6a165973fcafb9e341460aed15a1cea66
font_01_sfnt_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 12116 bytes
SHA-256: fd8f11be1f0525887e5ecc08038b7713b90101248d7e47e0cd2a035af8f6a30f

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