Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6ce91e35811666…

MALICIOUS

PDF

66.4 KB Created: 2021-02-26 01:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 65f5e3a0d5889890c804a8855f716185 SHA-1: ca87cb330411e3e10ff8d54a56b4f6953d16bd8a SHA-256: fb6ce91e3581166634c3b8f9061d9164179dd598ff4f4c52f2bf0e759ad52509
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified an external URI and an SEO redirector link, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but the primary malicious indicators are the external links and the malware detection signatures.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/wix?keyword=homedics+foot+pleaser+ultra+manual PDF link annotation
    • https://cdn.sqhk.co/lipetebo/V27S5Bm/14816859476.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/hcv2X95/android_radio_button_checked_color_programmatically.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/kovuxerozuburowaxataj3tvk9.pdfIn PDF document text
    • https://cdn.sqhk.co/neliwuwo/bVXgccB/5211994185.pdfIn PDF document text
    • http://1fps.ru/5312032075l7uke.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/ethical_hacking_degree_course_in_kerala.pdfIn PDF document text
    • https://cdn.sqhk.co/tidelefuzin/wii1jfc/26000259521.pdfIn PDF document text
    • http://trokot-online.xyz/dragon_age_origins_ultimate_edition_steam_modsu11mt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bojafazes/kovaloselumi.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/lajirusoletawa.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/22638767960.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/best_mech_in_battletech_tabletop.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/63314673845.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/english_to_mandarin_translation_app_for_android.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/the_devil_wears_prada_full_movie_download_in_hindi_480p.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 5260 bytes
SHA-256: 487880bd6987046ce08d6887c55e4c8822a9f48dfce71114eab0ca7314d4c496
font_01_sfnt_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 9984 bytes
SHA-256: 7731cdb794d192aaef18130411aa5ae6c5df98bf0f3583f7f93a0839393b04a0

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