Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcf691c634d259e…

MALICIOUS

PDF

80.9 KB Created: 2021-04-07 01:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 991f8b183b699a508b51bbf03923eddf SHA-1: d661be44dd4cb86806ed7be1e435c02e6d7d6859 SHA-256: bdcf691c634d259e75f8e1fa49278beaf4e999c799b2afa166848f45041ce3ad
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=organic+chemistry+brown+7th+edition+test+bank+pdf PDF link annotation
    • http://quickstore.pro/81148172596wgi1o.pdfIn PDF document text
    • https://cdn.sqhk.co/luzeginu/Ljgjjhb/baxamemupawugogera.pdfIn PDF document text
    • http://awpmode.com/68622021264iv326.pdfIn PDF document text
    • https://cdn.sqhk.co/sezabaxo/hfhidNj/1717626530.pdfIn PDF document text
    • http://geleostone.online/10018442727bss7r.pdfIn PDF document text
    • http://hookup671.site/contour_plus_meter_lancetszgaf9.pdfIn PDF document text
    • http://luminar3-download.xyz/read_sports_illustrated_magazine_onlinex095t.pdfIn PDF document text
    • http://supsun-aero.com/kambikuttan_net_2018fup9a.pdfIn PDF document text
    • https://cdn.sqhk.co/sovixojer/hi3z44t/44114341988.pdfIn PDF document text
    • http://lasleymarkt.ru/refovifazuvaganuvikh4hi0.pdfIn PDF document text
    • http://kindraretterath.com/45644797379myeek.pdfIn PDF document text
    • http://netewe9.xyz/how_to_connect_netgear_router_to_motorola_modem6khhi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc3c082-b828-43de-970e-70b96e6db64c/majujajora.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_c8fb0ae668d84b06b34e58987f0181a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb4c443-f623-4f2a-a650-17a680d98b39/which_is_better_linux_or_unix.pdfIn PDF document text
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_9271c48561b34a1bb5d1ba4defd7c943.pdf?index=trueIn 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_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 6040 bytes
SHA-256: 6da6ef71acd4b2a4506592b65c18e0f2b7fc127ee89c4ca492b68808638d1fab
font_01_sfnt_off00011235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 10500 bytes
SHA-256: c672653f274b0418bfbcb5a05f75b77bc0c965125314fa6753233c865e86317a

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