Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a780ee028bc4a89…

MALICIOUS

PDF

74.6 KB Created: 2021-02-25 09:10:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9f87460f8c85c0d223eda3c198af45dd SHA-1: 5add7006a339680bbe410fd04abac5e981cd7532 SHA-256: 1a780ee028bc4a89203c88d104fe69de4bb9c9d22baffb470b9615729c08d2cf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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.
  • 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://jottigo.ru/strik?utm_term=the+book+of+life+j+krishnamurti+pdf PDF link annotation
    • http://damodudajipofem.22web.org/vipobugajox.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/how_to_check_salt_chlorinator.pdfIn PDF document text
    • https://cdn.sqhk.co/kuluxasoge/h9AsnYs/sapepedejabiloju.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/biA6khe/malwarebytes_security_virus_cleaner_anti-_malware_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/mQVhiay/43090710841.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/ghtgjif/ak_47_wallpaper_4k.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/hdqgdja/53378081331.pdfIn PDF document text
    • https://ziwopigop.weebly.com/uploads/1/3/4/3/134380455/ab13424ffc45e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479674/normal_600ebc587026b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/what_is_f21_error_on_kenmore_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/wapking_marathi_movie_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/human_anatomy_and_physiology_3d_free.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/22801661834.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/thyroid_disorders_management.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_off0000e82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 5512 bytes
SHA-256: ef9d1cc8d3202e22319a85c11a0c73ff9007f8a51ba5755b8b5bc51e860153ab
font_01_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 10160 bytes
SHA-256: 581e130bbec096af6640c13787abaf9645c19cddb4721fb35dc3505f9d92747f

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