Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9357dd75b71bde2…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 02:27:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f64b7577c614ac812072909ac97eec7 SHA-1: d65fb55be7af6605932b61c72c939040b91354d8 SHA-256: f9357dd75b71bde2ae12f9c86ca0b5d92befcb326c18478e9f5bcfba9124a980
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to technical information. The presence of external URIs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=how+to+calculate+power+loss+in+optical+fiber
    • http://safodimim.iblogger.org/nevikizutagemodivapev.pdf
    • http://1xbet-regi.site/doguma8e5p.pdf
    • http://simupujumojata.22web.org/hot_springs_prodigy_hot_tub_cost.pdf
    • http://salonhq.xyz/low_calorie_snacks_at_dunkin_donutsq7zvd.pdf
    • http://sparzha.club/sebugedineji99qd3.pdf
    • http://ch-redirect.icu/56000437738pht0b.pdf
    • http://wiinorama.website/pharmacy_calculations_made_easyw7426.pdf
    • http://trokot-newshop.online/bernard_werber_demain_les_chats_gratuitq8isz.pdf
    • http://seamanygau.best/24401541573fxdp4.pdf
    • http://reetodo.online/tamawobxdf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e62d90d9-845b-491d-b9b1-804d55ccd6e6.filesusr.com/ugd/6af1ed_121aa459340d447ab1ad9216a249fd10.pdf?index=true
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_9418593de5cf4cbd9757feee869ad040.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e8aee71-99d7-40f4-8927-c48590c52e64/77171276208.pdf
    • http://zuvetimimu.rf.gd/35231573369.pdf
    • https://uploads.strikinglycdn.com/files/24006614-4748-4857-8899-267723e7c334/40356016697.pdf
    • https://uploads.strikinglycdn.com/files/87d2c6f6-a68e-4312-b80a-f1021f59d8b4/33581669967.pdf
    • https://uploads.strikinglycdn.com/files/514ba769-d6a0-4cfd-826a-b5be639854a3/43456840899.pdf
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_09267db7f4d04a379aca9c6dcc3afcc6.pdf?index=true
    • http://kirezalodonuni.epizy.com/the_master_key_system_audiobook_free_download.pdf
    • https://uploads.strikinglycdn.com/files/abebe1f0-9795-43a8-a6bf-0994ff46bf85/how_to_connect_bose_wave_radio_to_samsung_tv.pdf
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_afa2b99e463f43f5bf1fc9f70088c62f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/986b7d1c-cabc-4cb7-9a95-f556d641756b/6451026667.pdf
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_f420dec8a55b4f1e834442f100463721.pdf?index=true
    • 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_off0000ef69.bin
2f7e44930555d4f0c37f0d9052f7827e58669836c6d5f6a7c605c8d7ea7d3fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 5200 bytes
font_01_sfnt_off00010137.bin
541bdb2ddebc11dfcba6bdd3ca40872d80ef9d2d50092316c3f1778fcbad9c82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 10248 bytes

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