Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a368393ecdd457c…

MALICIOUS

PDF

91.0 KB Created: 2021-03-02 10:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a40ea6dc4bd6c74cec2cb8c13dfb47ba SHA-1: 4424c8eb9dc36459b1b65b0c20cc34736f968176 SHA-256: 8a368393ecdd457caa710f70874fb764cff256440738372dae6e1bc38b951c2b
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('botokaw.ru') that is likely used to host malicious content or redirect users. The document body, though heavily obfuscated, suggests a lure related to a 'rice cooker user manual', which is a common tactic to disguise malicious intent. The presence of external URIs and link farm characteristics further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://botokaw.ru/wix?keyword=aroma+arc-614bp+rice+cooker+user+manual PDF link annotation
    • http://jedadenawesezo.iblogger.org/angry_birds_movie_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489061/normal_5fe260a40ad2d.pdfIn PDF document text
    • https://meloxatug.weebly.com/uploads/1/3/0/9/130969811/b474e.pdfIn PDF document text
    • http://titujewegefo.iblogger.org/xunesevubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_600afe288597e.pdfIn PDF document text
    • https://pusurezifokuni.weebly.com/uploads/1/3/4/3/134317864/6662306.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/1093076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379964/normal_5fc7d1c24dddc.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimokizogo.epizy.com/74555653263.pdfIn PDF document text
    • http://kejarajavamoge.epizy.com/20431822941.pdfIn PDF document text
    • http://topabezep.rf.gd/what_word_does_not_belong.pdfIn PDF document text
    • http://nedebisap.epizy.com/siddhartha_translated_by_joachim_neugroschel.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/nikinusopaweg.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/79218240686.pdfIn PDF document text
    • http://balazetesu.epizy.com/recommendation_letter_template_for_company.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 1528 bytes
SHA-256: 7d2e14adf8657228b9723663c585d6b8cb13eb0d1b28fd2f673296922e2606cb
font_01_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 5596 bytes
SHA-256: 62982aa3b455aab3ef40d4b7bed9f1be6681608f39321e62a2d04a723112f482
font_02_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 15276 bytes
SHA-256: 1eb7369261064e53db6fad7b9129b05d4831f8429986ec65fd32926af6483fdf

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