Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e8373bbc54badc…

MALICIOUS

PDF

96.9 KB Created: 2021-03-02 14:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 1729fc176e5afeea70a08d16f84b1e63 SHA-1: 67fa60823b90eeaa174963b243c71af056aa551c SHA-256: 93e8373bbc54badc83bc47a00a9d7a4ad7fbc8d57b5006cb8be36a49580e0cec
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=essentials+of+modern+business+statistics+7th+edition+pdf+free PDF link annotation
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/7937658.pdfIn PDF document text
    • https://butijewib.weebly.com/uploads/1/3/4/8/134886415/fezunuxe.pdfIn PDF document text
    • http://wojurimaxab.mywebcommunity.org/59728796829.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/Iyzjdha/60797676865.pdfIn PDF document text
    • https://cdn.sqhk.co/fudopalizew/ayOx8ji/wheel_of_colors_for_painting.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/jeluditisinefesesoparele.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/xofeligo.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/hcSviiz/franchise_vs_sandbox_planet_zoo.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/38077.pdfIn PDF document text
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/8058701.pdfIn PDF document text
    • https://bijefalatobin.weebly.com/uploads/1/3/4/6/134629646/2322097.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/HgchjpE/shooting_bears_in_dens.pdfIn PDF document text
    • https://cdn.sqhk.co/kotolodegag/lDcjdib/zozarajapewezuxud.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/3hcgOig/266277301.pdfIn PDF document text
    • https://viropozokuputaj.weebly.com/uploads/1/3/4/4/134441516/4785af62bb68.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/jf6UYuh/82442207715.pdfIn PDF document text
    • https://cdn.sqhk.co/gezefesete/iNgiehh/assistive_touch_iphone_x_disappeared.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijedan.atwebpages.com/68613062208.pdfIn PDF document text
    • http://tumofif.rf.gd/wifemox.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/amc_8_2020_scores.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_off00013c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8C 5572 bytes
SHA-256: baaa6ef844fa437285a7e39ae14ee6fd7820a68d9cb04a8b045288fa6eeccad9
font_01_sfnt_off00014f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F58 11224 bytes
SHA-256: da892873a88a5723c54935e7b3d0152988586959f6965802b16ff66e69cd9dc5

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