Malicious PDF — malware analysis report

Static analysis result for SHA-256 566c17c39ee404f4…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 06:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c31bd4ad10fe3c447c78d6c04d48fbc SHA-1: eb06ddf55500acfaa1aef769e8727df6b354dfdb SHA-256: 566c17c39ee404f454ecd54ea1a371141385ff847f173244ea4efda30b306ae3
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a significant number of external URLs, many of which point to other PDF files. This technique is often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=vitamin+b12+deficiency+patient+handout+pdf
    • https://cdn.sqhk.co/zabeluzitema/irweSMU/shapeshift_jelly_with_shifter_games_free_online.pdf
    • https://cdn.sqhk.co/fofotixoz/ijriigh/cafetaria_marco_enschede.pdf
    • https://cdn.sqhk.co/dodamewope/Yj0gevZ/kobojizumizotukuxi.pdf
    • https://cdn.sqhk.co/wenudiwome/CicMggc/rumimuxaji.pdf
    • https://cdn.sqhk.co/zezovajav/Pii7Nic/34933459630.pdf
    • https://cdn.sqhk.co/livixugakuf/gcsgg1x/coloring_by_numbers_for_adults_printable.pdf
    • http://bewalunokonu.22web.org/gantt_chart_free_template_powerpoint.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3ae9886d-8875-42c3-bb1d-8597c9db8c25/logitech_z506_5.1_surround_sound_speakers_drivers.pdf
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_01f4d087a83f48d9b8a00934fba4fae1.pdf?index=true
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_b16178c13bc8435eb48d588df483d971.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c57f500-53f6-4b9d-a687-1d910d802803/garmin_etrex_30_user_manual.pdf
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_0947448e4ba74aab8831e464e63472f2.pdf?index=true
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_0ff0dc05c25049d4aa566a6678f55457.pdf?index=true
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_c572d55958f04230b53a8500919a6115.pdf?index=true
    • http://familule.epizy.com/49964947307.pdf
    • https://uploads.strikinglycdn.com/files/4f4ee95d-a257-4cb0-83f5-50db70d72215/16803013466.pdf
    • https://uploads.strikinglycdn.com/files/0d57b48e-2297-4178-96c2-0e820afcf048/the_possibility_of_evil_questions_and_answers.pdf
    • http://wufalejopasedor.epizy.com/phases_of_the_moon_worksheet_ks1.pdf
    • https://uploads.strikinglycdn.com/files/57c49ad1-c7ba-44da-b809-864bd383437b/95802499991.pdf
    • https://uploads.strikinglycdn.com/files/948c5fd7-5764-4a9f-b816-9c7a49a4f95f/accounting_terms_for_interview.pdf
    • https://uploads.strikinglycdn.com/files/1152a3e9-8fa6-4076-8651-5304e73a4d54/vawavafewuzekine.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66d.bin
99c2f3734d85fa08dd49d262ac1ed76ee0d9cc928e2de93bf79fd03f5a3b2b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 5480 bytes
font_01_sfnt_off0000f908.bin
03fa7caa50dda6bb22c87e733925c37d229b563d32c338203679b0d6be113746		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 10280 bytes

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