Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f40c02b566c5b25…

MALICIOUS

PDF

82.8 KB Created: 2021-03-18 06:27:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 84538b9bb395ed202f60c5f5021096c5 SHA-1: 1367cf8e271688ba6fbf05d920519d4814065052 SHA-256: 8f40c02b566c5b257a2c14e2ca64a8ab96eaa97f6ee14d34bfda531767091f48
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL pointing to a suspicious domain, likely intended to host or redirect to a secondary malicious file. The document body, though heavily obfuscated, appears to be a lure for a fake installation manual.

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://golowaki.ru/strik?utm_term=genie+excelerator+ii+installation+manual PDF link annotation
    • http://coupons2020.info/choose_your_own_adventure_book_clubfysem.pdfIn PDF document text
    • http://kreativoblako.com/ind_as_balance_sheet_format_2019_excelms7ml.pdfIn PDF document text
    • http://brettlockhart.com/mapenajakanagatudimegiwupkolab.pdfIn PDF document text
    • https://cdn.sqhk.co/gonuromabime/bjjiif9/jusaworimebugeluzajiluje.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/sikelavosega.pdfIn PDF document text
    • https://cdn.sqhk.co/kezagajasiw/h1ieAmz/academic_english_words_with_meaning.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/16312360331.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/jX8g5ha/jarowozajugaro.pdfIn PDF document text
    • https://cdn.sqhk.co/mubogasaven/bjcBNhg/free_music_download_sites_for_computer.pdfIn PDF document text
    • http://uscreditreport2021.info/verbos_en_ingles_para_nios_de_primaria7uk1f.pdfIn PDF document text
    • http://klokisik.space/xoxafa4og0h.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/lenovo_t430_compatible_ram.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/biwuwukesazef/xitududusugabuzukugapoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92abb55-30eb-4018-97ba-f8b45286a62f/vukovopavafijopozuv.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/waverley_council_planning_application_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/how_to_draw_anime_male_face_side_view.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/nda_admit_card_2018_upsc.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/lisibemifabolize.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/how_to_manually_eject_disc_ps4_slim.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/biblical_audio_pronunciation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/arteries_and_veins_of_lower_limb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45920e95-eb68-4842-bd66-a37fc3fe262f/bible_character_who_waited_on_the_lord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c87488e-2264-4469-9176-84ce167e2423/21832139211.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/73198640951.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 5044 bytes
SHA-256: 849c56f900b5c5c7f753477b6a79119e2e668b7c5e2ac07d5249f773dde7dc65
font_01_sfnt_off000113c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 11872 bytes
SHA-256: fbdff99bbe05e9cb7a0bddb6a9d61c0a4617f1692305841701d60a3f11088918

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