Malicious PDF — malware analysis report

Static analysis result for SHA-256 b223990b72fe2caf…

MALICIOUS

PDF

76.1 KB Created: 2021-04-08 03:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 157eab1adb0ac7b48971e223aaa28e4f SHA-1: 05edc3d53924e02246a3946370ee6ef1debd60ef SHA-256: b223990b72fe2caf0dd8c37f0b5929bcef595c2639731909cbd88c888128e3b7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-themed and point to other PDFs, suggesting a link farm designed to drive traffic. One prominent URL, 'https://leonvi.ru/123?utm_term=android+google+account+password+show', is presented in a way that mimics search results for password recovery, indicating a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly support the malicious nature of this document.

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
  • 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://leonvi.ru/123?utm_term=android+google+account+password+show PDF link annotation
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/12b9e3d1a187fa.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/nugiw.pdfIn PDF document text
    • https://nezikuwetop.weebly.com/uploads/1/3/5/3/135346993/nikikif_gaxanimijufomos_jurosifukuwomi.pdfIn PDF document text
    • http://duxezawiw.iblogger.org/renexozafuromuziwov.pdfIn PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/lavubidivov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446395/normal_5ff428f53e556.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373517/normal_5fffa34029bf8.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/vukusa/chicken_invaders_10_free.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_e42b61e38aa04e87a9658a33142c7104.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/65990926515.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/absorcion_de_hierro_en_el_intestino.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/zotokitigamibimuvamag.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_9d9f4eeae3fd4bad9a73e8313f859ddb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/56645319887.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/19908025365.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/adobe_reader_gratis_2018.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_b2123431bbc34d5eb842cf9f8883c61a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/92963185672.pdfIn PDF document text
    • http://wafubarig.epizy.com/7512500830.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/brave_browser_64_bit_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 5416 bytes
SHA-256: f01ac85318e1cf0022b0e317ec594837dc31a5b0678394d90e048e4357ffa02d
font_01_sfnt_off0000fc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 10924 bytes
SHA-256: 279f03a8de8be75d35e8925422e60d0eff859bfb7e98f02097c06131803fc414

Open this report in the interactive analyzer, or submit your own file for analysis.