Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c3f79439b804b5…

MALICIOUS

PDF

76.1 KB Created: 2021-04-14 18:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57a8f3562ca7942b14e71604d42099c0 SHA-1: 71ffaaff628fbc5694fa521caef18b09e1850a24 SHA-256: 72c3f79439b804b542a55fa67ba3224bff649652b09996306e622884b3407652
166 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://botokaw.ru/strik?utm_term=does+france+take+money+from+africa PDF link annotation
    • https://cdn.sqhk.co/zolilobup/LgcjeBR/middle_finger_emoji_keyboard_android.pdfIn PDF document text
    • http://tehnotop.site/regofasidosexom35f75.pdfIn PDF document text
    • http://managerprogram.live/letter_from_birmingham_jail_worksheekdni6.pdfIn PDF document text
    • http://levojefozaloro.mywebcommunity.org/bijamafizoniwaxaresoje.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/15370143360.pdfIn PDF document text
    • https://cdn.sqhk.co/gujurolekuma/Uihhcqj/52747437195.pdfIn PDF document text
    • https://cdn.sqhk.co/wugotiparo/ijhdggr/moxivi.pdfIn PDF document text
    • http://zejirejajedudu.getenjoyment.net/17222741309.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/who_is_our_lady_of_the_lake.pdfIn PDF document text
    • http://mnogoturov.com/223127117780rq9.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/gdRqcgA/powifibagun.pdfIn PDF document text
    • http://onlineeshop24.xyz/ic_engine_parts_pptz5gx3.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/rimepusox/boden_denim_fit_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/tetunibisudifiwizunewere.pdfIn PDF document text
    • http://dozuxix.myartsonline.com/zefafesuboxaruxojoxobele.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/dovutusizexikafinerunisad.pdfIn PDF document text
    • http://jamenajiko.myartsonline.com/sagevesilenimanemuzoxiji.pdfIn PDF document text
    • http://rogomore.myartsonline.com/vixawujamutepigejupitiw.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 8

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_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 5160 bytes
SHA-256: d6fbdb90e3e18288685c05022a7b4cf8c2b0634cce88744f39ebfbdb95a9f070
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 11772 bytes
SHA-256: de2d25f4c13ad6eb9801495b196f7e598952acdaa260413b5efbc24d0ce4c951

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