Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c266446b057512…

MALICIOUS

PDF

70.6 KB Created: 2021-05-20 04:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 573648ebfe5529abd7ece26095600f24 SHA-1: 645e8a3e5c4d2f6b25465fdd75df5c5686af3224 SHA-256: e7c266446b0575123a68b665c15bfa6c88d01648f2669b603d05177550c98861
156 Risk Score

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 high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with several pointing to Weebly subdomains, suggesting a phishing or content-farming operation. The embedded URL 'https://jacksth.ru/strik?utm_term=what+is+quickset+sdk+lite' further supports the idea of directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=what+is+quickset+sdk+lite
    • https://namevixezevir.weebly.com/uploads/1/3/0/9/130969021/zijunajeva.pdf
    • https://narefipikabisip.weebly.com/uploads/1/3/2/6/132682930/cf46e1fd2df.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/seditumok.pdf
    • https://vekiruwubutut.weebly.com/uploads/1/3/1/0/131070393/wibamodapu.pdf
    • https://vamemaxodoj.weebly.com/uploads/1/3/1/4/131437173/vopetilisubab.pdf
    • https://jemidezegin.weebly.com/uploads/1/3/0/8/130874295/monotata.pdf
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/6493563.pdf
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/mujaxuxemuxurulag.pdf
    • https://takojetomegupaj.weebly.com/uploads/1/3/1/3/131382497/7576767.pdf
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/748822.pdf
    • https://fomemavinujidi.weebly.com/uploads/1/3/1/4/131414297/fufifew_numil.pdf
    • https://joluduloj.weebly.com/uploads/1/3/4/2/134266967/fitil.pdf
    • https://mojebope.weebly.com/uploads/1/3/4/6/134609081/2bbdab0b14f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d57c9640-6d58-4e41-a641-a65a37de942e/libro_patriarcas_y_profetas_de_elena_de_white.pdf
    • https://uploads.strikinglycdn.com/files/d1656896-0a47-45ad-ba60-61bd6714c6ea/10896744186.pdf
    • https://uploads.strikinglycdn.com/files/26381d71-659c-41ce-8ca3-7e6438cda1a6/dnd_5e_warlock_invocations.pdf
    • https://uploads.strikinglycdn.com/files/542a1ced-4c22-492b-b711-bdc1691acd87/how_to_use_a_bissell_little_green_machine.pdf
    • https://uploads.strikinglycdn.com/files/f228c2fe-a435-4c59-a402-252768d9655e/68885390269.pdf
    • https://uploads.strikinglycdn.com/files/06c3113e-7890-4fdd-ab44-7cd0c18a73d1/classifying_triangles_according_to_sides_and_angles_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/cb038d50-c8df-489f-8601-a15015985481/elitech_stc-1000_manual_espaol.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_off0000d28b.bin
28687b46632c39bea9bc97b433594ec2d9e40f6d9709ad212fe52ae315213f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 5136 bytes
font_01_sfnt_off0000e40d.bin
cdf1c7ea82cf1b46d8c2059f531d0e835f56391d318ee7dc24944a1ebb095234		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 11672 bytes

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