Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e6eaced390c7e4…

MALICIOUS

PDF

71.3 KB Created: 2021-01-28 10:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e5b1fd1c860e48fcd88ef13378ee6e25 SHA-1: 02525f397dcd339d125623f36b2cff6a4224325a SHA-256: 99e6eaced390c7e460cb103c97765ecd4067984680a2e9847fa6c82a4596810f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution scheme, likely initiated via spearphishing.

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=amana+temp+assure+refrigerator+manual PDF link annotation
    • http://price-list.moscow/48456241805758r4.pdfIn PDF document text
    • http://cryogen.me/friday_the_13th_series_episode_guidewo4jh.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/jgLshbS/73249461155.pdfIn PDF document text
    • https://xasonametig.weebly.com/uploads/1/3/2/3/132303127/8955771.pdfIn PDF document text
    • http://salet.store/9494932573704xoe.pdfIn PDF document text
    • http://demask.space/29549130539gwz9e.pdfIn PDF document text
    • http://winfreeiphone.xyz/650526682498biqx.pdfIn PDF document text
    • https://tasekesin.weebly.com/uploads/1/3/2/6/132695719/92f3c538408c7.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/vMB8ljj/olympics_2016_results.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/rotatulibuxakazazo.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/jusuberu/muse_web_design_software.pdfIn PDF document text
    • http://bavubuseji.epizy.com/wavikebowovosasetisa.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/bullocks_farm_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/pediatric_cardiogenic_shock_guidelines.pdfIn PDF document text
    • http://pelubameta.epizy.com/scratch_3._0_free_for_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/31012558336.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/android_studio_connect_device_ubuntu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F9 5212 bytes
SHA-256: 7bcb669a38e2fcd9179c73c0ae4f7fc7ee97f84b2ccd234d13f083162e28a993
font_01_sfnt_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 10700 bytes
SHA-256: 4eb488d5ed03cdb584674b8a8c2ea50b3d3cfd5d5a2c96ce5e3b2023da2ac12a
font_02_sfnt_off0000fa6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 16184 bytes
SHA-256: f62da4868fe7103b7fe1703841174db6e80fad2405c4b5f0320e8b092b9bf050

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