Malicious PDF — malware analysis report

Static analysis result for SHA-256 a744af2910d5d1a8…

MALICIOUS

PDF

75.8 KB Created: 2021-06-11 06:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 618867460741f3f9422feca05848c802 SHA-1: e60dc246d6bf07e9ff6e452d0eeaec58b7b21f94 SHA-256: a744af2910d5d1a8c75f2db7328e70f570ccda5775a3467b61f6579fc0935e3c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'infrive.ru', which is likely the primary malicious destination. The document body appears to be obfuscated or corrupted, but the presence of external URIs and the overall detection indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://infrive.ru/pbw?utm_term=chashme+baddoor+movie+online PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9df9a9-dfb4-4427-875f-beeb7e8b4784/afterglow_wireless_headset_ps4_setup.pdfIn PDF document text
    • http://dokadeku.pbworks.com/w/file/fetch/144832140/is_sf6_a_covalent_bond.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b017cbf-0a2d-43fc-8962-3ff81812371e/stanley_fatmax_jump_starter_how_long_to_charge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea506ba5-4954-49af-b05c-5a0ea2aed89a/suwinukowuxatudegasawave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db14813-da49-4d66-a693-40a88c47d63d/73354257913.pdfIn PDF document text
    • http://xizisimavi.pbworks.com/w/file/fetch/144540909/sibipuxoza.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144412035/headway_pre-intermediate._workbook_with_key_5th_edition.pdf.pdfIn PDF document text
    • http://zegakodas.pbworks.com/f/bo2_jiggy_mod_menu_ps3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f01d426-a714-4d23-b316-ccbea2290bd1/59179537157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071d1b21-6459-4864-8178-3d8c05655187/el_himno_nacional_mexicano_completo_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8cc7d5-d979-4fb4-bb44-16a708c91936/beat_maker_3_apk_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a2151c-f4d8-4f68-96ba-6cdb72aabab3/42455005435.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/f/libros_para_colorear_princesas_disney.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/f/22801261165.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144476637/2005_volkswagen_jetta_owners_manual_download.pdfIn PDF document text
    • http://dawanitapix.pbworks.com/w/file/fetch/144722469/tinololeva.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144787743/fapizurekuzerumabib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff887da-f664-466b-bbee-5f2bdd00ef94/how_to_change_from_radians_to_degrees_on_casio_fx-991ex.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144701241/ace_china_restaurant_trenton_fl.pdfIn PDF document text
    • http://jowukon.pbworks.com/w/file/fetch/145082310/getinsta_apk_download_for_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d7cae0-2501-435e-a549-04e63a2dd982/how_to_apply_for_medicaid_michigan.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_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 5172 bytes
SHA-256: 7866177e889bdfa326f3dd44ce8a65077285baf7b14936ea18bd33af5f9de4b2
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10828 bytes
SHA-256: 8b22b7926ddf78c3d5d8b4470f662d61c8bbe2f394518845493252a901c743c8