Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5abf50b7588569f…

MALICIOUS

PDF

80.7 KB Created: 2021-04-24 00:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2bef6dc61ada24b96cbf671cc19da7b8 SHA-1: 21210086593ddae81769d750794ce7ed0c50e501 SHA-256: a5abf50b7588569f609772abedb84ebf251b0bd0222ef3c5d110d133275a0127
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=netgear+n600+change+wifi+password PDF link annotation
    • http://zabogena.iblogger.org/figurative_language_worksheet_2_answers.pdfIn PDF document text
    • http://lasns.fun/ngha_cu_ch_xem_tt_ao3en8u.pdfIn PDF document text
    • http://mopobixufiveve.22web.org/direbosojodididep.pdfIn PDF document text
    • http://air-calm2.club/pycrypto_python_3._6y169v.pdfIn PDF document text
    • http://momentshop.website/pisopifumalemoroladasum29lq.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/ribowexulo/wegomalepisidanekab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7accdbc-6743-46a9-9c84-bbf5ea906179/is_primal_kitchen_bbq_sauce_keto.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_5e1dbd64e8ad49e98b5b7a445c1668d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37ce139-924d-4364-b5ce-967efa06a778/41972126793.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_3c043accd3004eb28e92a375d0978819.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/085b3945-ffe8-4da5-9e48-00ca78cebbe7/77631438999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9178ae-c3d9-4548-a128-f36876a4fd5a/84780960930.pdfIn PDF document text
    • http://refawolasuwibi.epizy.com/bozok_niversitesi_formasyon_akademik_takvim.pdfIn PDF document text
    • http://voronuxo.epizy.com/54969253078.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/91723869244.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/83940522879.pdfIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_ebabb81e6b08464b80e14c914fec908b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/how_do_you_reset_the_ecm_on_a_cadillac_cts.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/mofiwifelizononojipi.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_2b0e69fa7a3a4ac8be3544e8af50f14a.pdf?index=trueIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_ae9284ad7baf49f7bdb02499d22af78c.pdf?index=trueIn PDF document text
    • http://fivexuto.rf.gd/how_long_do_compressed_earth_blocks_last.pdfIn PDF document text
    • http://varijaponinaza.rf.gd/65802569706.pdfIn PDF document text
    • http://wijagukibe.epizy.com/patrick_kelly_author_tax_free_retirement.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_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 5744 bytes
SHA-256: f7e032d02e8622d2cf9161b35a3713a64bd3aa34af0aa97b40cdb30090ed51bb
font_01_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 11572 bytes
SHA-256: 62edffd972ffbfb5e322772708b046337ee7f882ffeaa9159314058cda222012