Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1835cc9ee06013…

MALICIOUS

PDF

84.4 KB Created: 2021-05-26 03:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 64f16f9c234a32f9ac78dca48d5df593 SHA-1: 236159687f70681715048fa3636357f48d7b1e8e SHA-256: 9b1835cc9ee06013753687962d6011d04b713bfdaa317949fe8016ca5567af20
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/strik?utm_term=fashion+pulis+blind+item+answers+2019 PDF link annotation
    • https://kuritemu.weebly.com/uploads/1/3/1/3/131383398/deduwadefijudefap.pdfIn PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/laboxo.pdfIn PDF document text
    • https://kabapavubume.weebly.com/uploads/1/3/4/7/134742816/829051.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2249ec44-865a-469d-bf9b-32bd3af8582f/dokore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcba7978-5247-4023-b4fa-f884348f2997/pays_basque_france_departement.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/hd_wallpapers_for_android_mobile_full_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073356ae-5549-48e9-9724-4f47e1abb264/icom_ic-706mkiig_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6aaf14d-03f7-41e7-8124-a0b8b9185bca/50603167320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7d71a7-b8b0-4e16-ad91-7b26c52b9f13/presidential_line_of_succession_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0215f306-7037-437a-9086-a4f10fbcc8fd/tamilrockers_hd_movie_download_2018_telugu_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f679e644-9615-4cab-8b98-71517b9d98b2/gimazozevomagoputex.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/how_often_should_you_put_ridex_in_your_septic_tank.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/11095895719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e283bc-701d-4e77-8ed6-fada9ed6d790/fiat_stilo_workshop_manual_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573f4967-49c5-4ad6-badd-84e0a8a6c06d/the_hormone_reset_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21332f5b-1234-4fe9-be86-4cbcf52e3c5c/supply_chain_management_systems_include.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d9dd24-ef7d-4193-9f38-55907ae10d9e/13701496142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2173b944-d397-4115-82f5-a83bcfd92aa6/toyota_rav4_fuel_mileage_1996.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/brother_hl-l2380dw_manual_feed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c53d721-5cc0-4267-b958-54c295312468/fokutamalev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ba261c-1831-4d09-a176-703c4cebcb5c/19980397099.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/north_sound_antigua_cricket_ground_pitch_report.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_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 5868 bytes
SHA-256: e0477eb88612efc565b1807586385dc18d21169555c0c90e86e1270d34b2bd2b
font_01_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 10904 bytes
SHA-256: 70f88578f0e2b0a820803495dbb1970ace7efef094018caada463594ed2dc327