Malicious PDF — malware analysis report

Static analysis result for SHA-256 163502b85321a9d0…

MALICIOUS

PDF

73.2 KB Created: 2021-04-03 08:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b985356586c8eb13fceaca6baee4b19a SHA-1: da9fdfec6f59f441f14c2c9ba1bac22496deb31e SHA-256: 163502b85321a9d0c6b68431b6fc63e201e85ce97b3ce720924b38a70e1f1003
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL, which is a common lure for phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=excel+data+visualization+pdf
    • https://cdn-cms.f-static.net/uploads/4388165/normal_6047ddae352cc.pdf
    • http://furniture21.online/mhw_bow_gear_guidekkush.pdf
    • https://cdn-cms.f-static.net/uploads/4449984/normal_60622a31a94bc.pdf
    • https://cdn.sqhk.co/basinasedu/gifoxgc/my_sprint_appointment.pdf
    • http://dazavaluk.mygamesonline.org/aspectos_biologicos_de_la_sexualidad.pdf
    • http://zafikapasipugog.medianewsonline.com/automobile_plastic_parts_and_their_materials.pdf
    • https://static.s123-cdn-static.com/uploads/4414339/normal_5fddcce5abd3b.pdf
    • https://cdn.sqhk.co/fefamuve/cnifyhd/breadwinner_synonyms_dictionary.pdf
    • https://cdn.sqhk.co/lubometusoz/W45dDgi/crazy_gang_wars_game.pdf
    • http://nejupike.mygamesonline.org/40517057843.pdf
    • http://wemorewabadeluz.mygamesonline.org/vowel_and_consonant_sounds_in_english.pdf
    • https://cdn.sqhk.co/dejijadu/e4jDfia/answer_to_the_clock_calculator_lightbulb_math_problem.pdf
    • https://cdn-cms.f-static.net/uploads/4388619/normal_6065ab55b2726.pdf
    • https://static.s123-cdn-static.com/uploads/4483586/normal_5ff218da8d9b3.pdf
    • http://kurametugugu.mygamesonline.org/calculus_bc_practice_exam.pdf
    • http://folejaf.mypressonline.com/anatomy_of_stomach.pdf
    • http://acupofjacob.com/44957166659lf6il.pdf
    • https://cdn.sqhk.co/zogowefu/haieidM/football_manager_2020_team_database.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://milebulijulami.onlinewebshop.net/teboxepoxazuz.pdf
    • https://uploads.strikinglycdn.com/files/88843945-c81d-4e22-b1ee-015b44236adc/25612726178.pdf
    • http://wiwosotu.myartsonline.com/1110788450.pdf
    • https://uploads.strikinglycdn.com/files/8ecf935b-ab33-4b51-a2f8-6518ae48200d/rupozogipabedoliwikuk.pdf
    • http://satovimowenijor.myartsonline.com/30847523286.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_off0000e275.bin
1f742e1226834f0817e5b0587f28e58bb60a3f69394183af0449320a9d0d6929
pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 5188 bytes
font_01_sfnt_off0000f44c.bin
a10ac57755a0c19ec4d921f02e3ab91fee83826a8a87feef42dfc0b7534c4a0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10420 bytes