Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf92b999591471f0…

MALICIOUS

PDF

73.2 KB Created: 2021-03-28 13:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0aab87fee37048a84417451b03eeebe7 SHA-1: decb01fff5c919d4423cf5999d60ecd333e93b5f SHA-256: bf92b999591471f07454c4c8720f890de376549288c6e37126b6457d3283df7c
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=a+bugs+life+movie++480p PDF link annotation
    • https://cdn.sqhk.co/sadebupunen/hbIQPgf/android_studio_gradle_version_error.pdfIn PDF document text
    • http://puwokewekiful.iblogger.org/conference_poster_template_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_603ea1e439520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475875/normal_5fe807f5c3e62.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosavafiju/hRqceS8/30359358312.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/dibDdhi/37485739417.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/Z6ijLia/adults_coloring_book_pinterest.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451742/normal_6022e5d44464b.pdfIn PDF document text
    • http://jedivemogikopad.22web.org/milujobifusemuv.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/Tgevqgi/descargar_pac_man_fever_ps2_espanol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_5fd8d63270bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379859/normal_600c11330e30b.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/f0803289-a5d0-4a26-8a68-a9f13c0cc3db/is_roku_streaming_stick_plus_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98263066-a58a-403e-8480-059e4a11e4f4/24746457309.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_08d74b7e3288426587c48e59dfd20623.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8246d8-e9dc-4ed3-95d5-add6ed813147/25228060554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa888eb2-27d9-4ea8-a7eb-08043515a923/logegusij.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_cb85fb3e3be2493fa06e04ac4a8160d4.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 7

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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 5528 bytes
SHA-256: 4f3eed669a42e7975fd08c488e56ae279a06dd1a27b1ddab68237d110db481b4
font_01_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 11012 bytes
SHA-256: 82a0ec4a0d1e4336fc3b0aeeb616782fe7efc409665e1e1a30543ee953aba550

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