Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d7b011aeebce32…

MALICIOUS

PDF

73.3 KB Created: 2021-03-01 07:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 520a9ebb358c9faf09b932ff7453f61a SHA-1: 985d5d381f72cce329508351b7a2092ca34af810 SHA-256: a5d7b011aeebce326b0e8a1995525cf319b28cca03b3cf809dccb501269343c2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://xajibur.ru/123?utm_term=the+road+book+short+summary PDF link annotation
    • http://doporujela.iblogger.org/jufirupudabonep.pdfIn PDF document text
    • http://buluzapigal.22web.org/what_is_the_theme_of_cinderella.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/gfjajab/xesofebi.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/g1BBBsN/sogebanking_numero_de_telephone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_602436e2a867e.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/5Ejfibj/easiest_skateboard_tricks_before_ollie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_60218a3d34f21.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/clEjjha/kateluwudos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_600af282b0719.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutenujute.myartsonline.com/tajerosilikefedufenufezas.pdfIn PDF document text
    • http://junorijuzijipu.rf.gd/wacom_bamboo_cth-_661_s_driver.pdfIn PDF document text
    • http://tinijev.epizy.com/guided_access_samsung_j3.pdfIn PDF document text
    • http://roteniju.rf.gd/nordvpn_cracked_apk_free.pdfIn PDF document text
    • http://nibubatovavav.atwebpages.com/hp_envy_4500_driver_unavailable_windows_10.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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 5288 bytes
SHA-256: 0caba23625694d22e998a310cbd9938763e46b6facc87759115c30d2125019b3
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 10424 bytes
SHA-256: cf5072f96fbf13d4d88a6c0f41788b79f8c050ad2f1e1e27c1f4e4d835510d7e

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