Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08e5e3f5a3763e0…

MALICIOUS

PDF

82.5 KB Created: 2021-04-01 22:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d6181593072155fdb8da817896b28dce SHA-1: 93edf55608d9173bd6307e2cbbb7abd43f48a448 SHA-256: c08e5e3f5a3763e0c9ea7c5867edfcb5ba12d973d4481f1a4f9b57a10cc90d68
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous external URIs, including one pointing to 'nipisod.ru', suggesting it's designed to redirect users to potentially harmful websites. The PDF's structure and embedded links are consistent with a phishing lure, likely attempting to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://nipisod.ru/award?keyword=curriculum+development+process+in+zambia+pdf PDF link annotation
    • https://cdn.sqhk.co/bedogipaxog/bRdgfge/37983984411.pdfIn PDF document text
    • http://drnextact.xyz/643880581115u9dl.pdfIn PDF document text
    • http://zarabatyivat.ru/nick_saban_explaining_the_processco1h4.pdfIn PDF document text
    • http://shopmzm.site/world_war_z_game_review_2020utqio.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/Ohcih3T/duwuvojikusunukiziv.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/jd9ghjd/11807877061.pdfIn PDF document text
    • http://uptodate.site/business_process_modellinguuq9w.pdfIn PDF document text
    • https://cdn.sqhk.co/jegivoziba/j6lhjGH/20800549733.pdfIn PDF document text
    • http://datingsexchat.site/supernatural_cast_season_14xgkvs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e28b13d-ef5c-4d18-821e-e071a8932918.filesusr.com/ugd/0b0738_109de9dc934f42d2b4125f2eaab09c2c.pdf?index=trueIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_2a156b02ed914f95825ceb57ac759792.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/52419289613.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_57d8bb24533a4f8188dd060bf43939d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2ebd58-393e-4976-b1f3-6b4275135312/captive_prince_wiki.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_4848ebc0e2e64acda471e927ec1c5516.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/135b356b-d619-4759-a108-061aea20c227/blackjack_weapon_knockout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415be1a0-96a9-4c67-9e45-82909b21e088/pusazitodekelajezisesogam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d34cf15-319f-431a-bf11-996ed8a753f5/kwanzaa_reading_comprehension_worksheets_free.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_cfca4cd1c9974f23b015953606455b95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/13371720467.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 5456 bytes
SHA-256: f4399ddcd0d26dfdb9199ce1e243721e696084b56bc8cb0a2260587a7d1369b5
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 10344 bytes
SHA-256: 74927566e6f370d17722ab7c461d0343ead631b021f0ba10418f234e8844ef5f
font_02_sfnt_off000126b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 16384 bytes
SHA-256: 525624c5dbd14d79723f249e8b567574e5e64a9ad2a097807b85c806ed58272a