Malicious PDF — malware analysis report

Static analysis result for SHA-256 653825d5f6d2f24a…

MALICIOUS

PDF

64.6 KB Created: 2021-02-09 12:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c81aa38a2eff75093a1b8caba6160d53 SHA-1: b77c75a8dabf10896c54aea0d7ccf9364d97539b SHA-256: 653825d5f6d2f24a4e9718172b6c627c98e964b0690b69e380ecc58a6854d0aa
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm designed to redirect users to potentially malicious content or phishing sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a movie title, which may serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=heropanti%20movie%20flute%20tone PDF link annotation
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/1446647.pdfIn PDF document text
    • http://favovuzoxegavix.22web.org/aorus_elite_b450_manual.pdfIn PDF document text
    • http://purpless.vip/25761252473q4r1j.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/jfgiB4N/shake_shack_order_now.pdfIn PDF document text
    • http://wide-take.top/72630800672qlj92.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/djfYQed/86084378727.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/1283668.pdfIn PDF document text
    • http://vikidavilor.22web.org/mogisazineduwomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lipesomidu.epizy.com/8239935726.pdfIn PDF document text
    • http://funazowo.rf.gd/iq_test_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/resimamitemupuku.pdfIn PDF document text
    • http://tosogaxaf.rf.gd/94295848586.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/charoen_pokphand_group_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/cherubic_crossword_answers.pdfIn PDF document text
    • http://mibexumobanoko.rf.gd/martyrdom_meme_template.pdfIn PDF document text
    • http://fazafowunop.epizy.com/acog_guidelines_for_gestational_age.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_off0000c31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31D 4888 bytes
SHA-256: b9ca590134114e176d9ce069abf40fd27a0744f123213dd5f09f71bddc818bef
font_01_sfnt_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 9852 bytes
SHA-256: ab404d22bf5d05c1de5868d511aad4ac73193291953617b04385e1e9609a2191

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