Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d923908db027431…

MALICIOUS

PDF

73.7 KB Created: 2021-02-15 03:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e0dbb638143a414cf928099c5226349d SHA-1: e12fe6c210af33da9c2730c1c6ff141be25afcc6 SHA-256: 8d923908db027431df1e1c3989fab6a5887e9876ca3558413ffb03b219edc8be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/wix?keyword=the+beginning+after+the+end+novel+pdf+book+1 PDF link annotation
    • https://cdn.sqhk.co/tajiwikiter/bgijeif/dulitupeliluj.pdfIn PDF document text
    • https://muwirejevom.weebly.com/uploads/1/3/1/8/131857435/pureduw-jobokaxarurel-fijivodarin-pisudason.pdfIn PDF document text
    • https://cdn.sqhk.co/fozozumaj/jcjehgn/free_text_notification_sounds_for_android.pdfIn PDF document text
    • http://zakunofukar.iblogger.org/firefox_android_bookmarks_widget.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/hj1jiji/justice_rivals_2_cops_and_robbers_mod_apk.pdfIn PDF document text
    • http://zakababonedip.iblogger.org/butubojaluxeges.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/9042228.pdfIn PDF document text
    • http://kusadelopo.iblogger.org/47063538022.pdfIn PDF document text
    • https://mirepabokotixiz.weebly.com/uploads/1/3/2/7/132712407/379705.pdfIn PDF document text
    • https://tupusedaluniji.weebly.com/uploads/1/3/0/7/130738871/sepanibuda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fozovevozasox.epizy.com/35753334393.pdfIn PDF document text
    • http://gofirog.epizy.com/spider_man_3_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/osrs_flipping_guide.pdfIn PDF document text
    • http://lukoleni.epizy.com/autodesk_maya_2012_tutorials.pdfIn PDF document text
    • http://boponewutizubi.rf.gd/50474249638.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_off0000d710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 5180 bytes
SHA-256: 09f8c0176eb21cffca2fc250f283cef9074d8ee9ebe7a094cbeea3ff0d68e106
font_01_sfnt_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 10216 bytes
SHA-256: 4f5774518aefefe3ffef16f92b96daa20c894f9c29993545d07d379c4fa50497
font_02_sfnt_off00010ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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