Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab73a6c43ac3c65…

MALICIOUS

PDF

79.2 KB Created: 2021-04-11 22:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 66d38506e004496c540c83dc48b47ae2 SHA-1: 2ebd894afc82a2f0dd2bb676aea9021fb0000a5e SHA-256: bab73a6c43ac3c655b8514783dfb7572dff17549afa26eb95eb7440fce54b76d
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is likely used to host a phishing page or distribute further malware. The embedded content, though heavily obfuscated, suggests an attempt to disguise malicious activity. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=what+time+do+the+stock+markets+open+in+australia In PDF document text
    • http://mazejofeg.mygamesonline.org/jubojojejaj.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/fcjcjfq/new_song_ringtone_2019_download_pagalworld_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/jedabawefi/iihEsOb/author_s_tone_worksheet.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/cancer_espinocelular.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/ehbjcKR/mevulajasim.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/ghbgcYN/mirrors_lyrics_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/Dldjcuc/fm_radio_receiver_with_bluetooth_transmitter.pdfIn PDF document text
    • https://cdn.sqhk.co/guzufaseba/gjBMeuT/vector_robot_subscription_uk.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/44260707079.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/zosevid/21056138570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6d6e56-4aee-42c5-b058-5e165713a582/tipovajuxobovivimusuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f315b9-2c51-4883-9e65-b9a7fe8cd7b6/sumavajakiwisitebenum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d9302d-6ed6-4428-88df-91873cf6b8cd/how_to_replace_ink_cartridge_epson_xp-424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42514d3f-dadd-4b5b-bfec-88fcfe4ec9ed/relion_prime_blood_glucose_test_strips_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/wugimurokotokudonalerus.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/bacula_file_daemon_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/pefukirotarafegibes.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/babul_de_vehre_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20252b7f-60ca-4777-98ff-a74dd44ef0b3/motorola_mc9090_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e30e98-08a3-42f2-aa51-254fc231c073/losupisop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d22afc-30a1-43db-a56d-7e83ee97201c/what_is_a_general_warranty_deed_with_vendors_lien.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eeac4c6-bca8-4ac4-bec1-3af325f7bee6/sogesokerogadok.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_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 5392 bytes
SHA-256: 19869da01cfd64d65c3df2c34eb4aa361b8cc32a4b6894bcaf1ac00f3a043681
font_01_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 11284 bytes
SHA-256: 1322d6e4b584be04489e0dd5e0d62012d8e3cf826cb811215c3b7ee016149eb5

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