Malicious PDF — malware analysis report

Static analysis result for SHA-256 603134967d90ded3…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 13:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8ea248d5a95d23435cbde206d025861 SHA-1: 7f3f43750ca5ffca3e3e92b31c55514106fcbc44 SHA-256: 603134967d90ded3786837b18fbc17e7d018319e02829cb57007bbf0db3ae240
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'midufefew.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to administrative documents for contests.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://midufefew.ru/award?keyword=atos+administrativos+para+concursos+pdf
    • https://static.s123-cdn-static.com/uploads/4374536/normal_5ff27cd9dac19.pdf
    • https://vinetiwufo.weebly.com/uploads/1/3/5/3/135305890/2797842.pdf
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5ff8acf854be6.pdf
    • https://cdn-cms.f-static.net/uploads/4477139/normal_600d61c99336f.pdf
    • https://cdn-cms.f-static.net/uploads/4487184/normal_604d165897500.pdf
    • https://cdn-cms.f-static.net/uploads/4381528/normal_602a831febf36.pdf
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/zinigu-rokipojuxow-pomorowumitiji.pdf
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/gowav_liwinodaro_susof.pdf
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/lowimibap-samakiv.pdf
    • https://static.s123-cdn-static.com/uploads/4465249/normal_5fe03c3bf1e8a.pdf
    • https://cdn-cms.f-static.net/uploads/4461746/normal_60177c4f8ce22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nagudo/mixed_fractions_with_like_denominators_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/4520eb89-c768-4527-bc25-a62cafe5d584/how_to_unlock_blackberry_leap_for_free.pdf
    • https://s3.amazonaws.com/davolazupivowi/getasitokenobu.pdf
    • https://s3.amazonaws.com/kitakilesa/mujaroxutawitaxobimupi.pdf
    • https://s3.amazonaws.com/megodipewukitoj/jolly_phonics_games_online_free.pdf
    • https://uploads.strikinglycdn.com/files/92b204e8-8dc0-4a41-bb62-e6b8c904da36/how_to_write_with_pen_on_cricut_maker.pdf
    • https://uploads.strikinglycdn.com/files/91f678d5-c990-4962-80a4-304cbee4df03/38567552143.pdf
    • https://uploads.strikinglycdn.com/files/5116bdd2-6245-485d-b043-5e801ed29951/mechanical_engineering_degree_online_florida.pdf
    • https://uploads.strikinglycdn.com/files/5d3a6a4b-6874-49c1-9870-fb21fac45416/2000_jeep_grand_cherokee_v8_specs.pdf
    • https://uploads.strikinglycdn.com/files/2ab9ad13-3bf8-433c-802f-7aede5901da2/kenmore_110_dryer_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/92fd200b-b9b9-4927-81ba-f5a1c515261a/10_letters_is_the_art_of_using_type_for_communication.pdf
    • https://s3.amazonaws.com/dedinavesute/22858023683.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_off0000f3fb.bin
696405c181168cc14cfa04a98ee27510414ec71af582ae03bd95697de4da9291		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 5316 bytes
font_01_sfnt_off00010605.bin
ad34e7ccd4d82f80cd79c0adb33b5e1460f8120d2269f8a229672871309f9ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 13736 bytes

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