Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c97ddd3e552109…

MALICIOUS

PDF

76.8 KB Created: 2021-03-18 06:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c2349dc4ca4571d5f627851cdeb64d6 SHA-1: e811eddc3ae3632d8747d5e3bec88b17523e2bc8 SHA-256: f5c97ddd3e552109eb37743e8fd4262d4b9de7d6dfd8a2cf9890c64f95dac2a5
164 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or malware distribution scheme, indicated by a high number of external links pointing to other PDF files, suggesting a link farm for SEO manipulation or malware hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malicious content. No scripts were extracted, but the presence of numerous external URLs is a primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=cbse+class+2+maths+book+pdf+download
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/1035103.pdf
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5ff29232278d8.pdf
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/ab08ba32b.pdf
    • https://lakomefolowe.weebly.com/uploads/1/3/0/7/130776578/vonuki.pdf
    • https://cdn-cms.f-static.net/uploads/4467322/normal_604a2cd0b8e72.pdf
    • https://cdn-cms.f-static.net/uploads/4421472/normal_602e19c8779cd.pdf
    • https://cdn-cms.f-static.net/uploads/4496146/normal_6025b4e1f2031.pdf
    • https://wezobugedelu.weebly.com/uploads/1/3/1/8/131856743/miwenaluw.pdf
    • https://padasalami.weebly.com/uploads/1/3/4/5/134597779/732388.pdf
    • https://vifegozotamideb.weebly.com/uploads/1/3/4/2/134236473/fetuzew_rudoxofa.pdf
    • https://cdn-cms.f-static.net/uploads/4458623/normal_603e8cb92a5bd.pdf
    • https://cdn-cms.f-static.net/uploads/4502819/normal_601134c1b5adc.pdf
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/f170ab17.pdf
    • https://static.s123-cdn-static.com/uploads/4486053/normal_5fcaebdda9086.pdf
    • https://cdn-cms.f-static.net/uploads/4467564/normal_60338de35e675.pdf
    • https://malugeko.weebly.com/uploads/1/3/1/6/131636988/fonavejomenoxuk.pdf
    • https://cdn-cms.f-static.net/uploads/4370288/normal_604ada5980c76.pdf
    • https://cdn-cms.f-static.net/uploads/4422378/normal_601b2c7ab4846.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_cd6082d51c164c2daef4c60df3e86208.pdf?index=true
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_664d2a8a2c244890960ba4a6f9efad03.pdf?index=true
    • http://tamedigozetot.epizy.com/20241586248.pdf
    • http://sawatirexusuwiw.epizy.com/26533565508.pdf
    • http://zuxekesimulir.epizy.com/permit_confined_space_entry_log_template.pdf
    • http://wesufonezis.epizy.com/badsha_the_don_full_movie_filmywap.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_off0000ee3f.bin
4c1515ca00bfb31de8a9d7ffe0d69ef968a39743c8b9d150dae1d1e359eb27f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 5632 bytes
font_01_sfnt_off00010152.bin
9532e58cd35445275d5543e459a35cd9ab289d7397688695851c22dd1484b6b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 10580 bytes

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