Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec85c58cc3ec7f4…

MALICIOUS

PDF

92.7 KB Created: 2021-02-24 20:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: db2dab41d1c91560429fb8336887ea8f SHA-1: 4a659f40591d4cf1e11bb8c1478799d676bd1bbb SHA-256: fec85c58cc3ec7f4cfc350f931599396b0a7ad25224a66d6f675f5047643a8dc
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'drug book' and '2021', suggesting a lure for users seeking information, which is then redirected to malicious infrastructure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=davis+drug+book+2021 In PDF document text
    • https://cdn.sqhk.co/gomiwopizi/8PyvvaD/lodomojerobivatokoja.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/Jhj05FD/jugifugejakisukexotalobod.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/logitech_f710_driver_download.pdfIn PDF document text
    • https://fuviwamirami.weebly.com/uploads/1/3/5/3/135351498/8423149.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/fgjJghu/skins_movie_cast_2019.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/craftsman_belt_disc_sander_repair.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/nerugiraxura/78955700442.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/does_cognitive_behavioural_therapy_work_for_social_anxiety.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/gigabyte_bios_update_software.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/romeo_and_juliet_act_1_scene_3-4_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/70651031674.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/itinerary_template_for_family_reunion.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/hp_5510_printer_software.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/miguzasaluger.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/future_going_to_questions_short_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/3_types_of_leadership_styles.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/zulurivi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 19748 bytes
SHA-256: 6b05bd904f5d25090aed36b6fc5a1e4e20493755ec6530615f51395c553323d2
font_01_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 5548 bytes
SHA-256: bbad41b47128921abd7aad52926b450a1d9923d88b7ffa777fc3f2354bc7bbf3
font_02_sfnt_off00013e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8E 11432 bytes
SHA-256: 5dd9aa7c1d66f80b11bd30bd03e002018b399011bcd7c7fe1b97c5fa4c610812

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