Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b87e6a5cec64327…

MALICIOUS

PDF

78.2 KB Created: 2020-12-27 15:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ba050f0cba1a08245658b1fc13f18f5e SHA-1: e8b5c08187ece56508b845bc917d64f0797ffea3 SHA-256: 1b87e6a5cec643270023bc0a03170a3d5d22968db16e7eaea8bf41404cc142c7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link, specifically pointing to a URL that appears to be a lure for downloading software. ClamAV also detected the file as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the redirector suggest an attempt to deliver a malicious payload or lead the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?utm_term=school+of+dragons+mod+apk+2020+download In PDF document text
    • https://cdn.sqhk.co/lasesekov/Ggjkhex/guided_readers_and_writers_fountas_and_pinnell.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423137/normal_5fcf82a5c405c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f98462c0f6df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_5fd3d749aca54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_5fc35f4f548a2.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/Jvehbgi/bevikelatigizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480589/normal_5fadc9eb04e1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_5fc1170c12257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_5fbcf1232b6a4.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/xhbSGvz/kexeb.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/xanebavifamopez/recurrent_carpal_tunnel_syndrome.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/81437416796.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/69842593571.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/aera_annual_meeting_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/dujaxixibozidunama.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/acronis_true_image_2019_universal_restore.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_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 6100 bytes
SHA-256: 072a715065ffe26420e8d537918c223bc3bd8a9d2bc7620cffea128a23b06097
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 10960 bytes
SHA-256: ae07d0a61efb8a498d2b0787ab13efac6d8e46776fc47c0f27fe63e393b2e404

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