Malicious PDF — malware analysis report

Static analysis result for SHA-256 49eb7f2ce0bea191…

MALICIOUS

PDF

190.0 KB Created: 2021-04-30 16:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 749fee5648684170f39325b2eb920716 SHA-1: 571f9885b484ef506f9b5a683b810d6566721a01 SHA-256: 49eb7f2ce0bea191bb2d4fa5722979580b9346765b1bcd0811197812c7e92a3c
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 0.9997

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://xajibur.ru/strik?utm_term=appointment+meaning+black+law+dictionary PDF link annotation
    • https://cdn.sqhk.co/wolowivem/jcgjNEs/betujudunulabapikag.pdfIn PDF document text
    • http://nikubet.iblogger.org/crochet_patterns_childrens_hats_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sebuwemid/XrdCijC/neogeo_x_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_601b42b0823c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_604952bbcafc0.pdfIn PDF document text
    • https://cdn.sqhk.co/dawiredi/fhiH0hh/baleful_synonym_word.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugonowelimije.epizy.com/71940233244.pdfIn PDF document text
    • http://zesivigodexewig.epizy.com/doubling_farmers_income_by_2022_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a3ce94-937c-499a-9242-f524784059c5/kinetico_water_softener_brine_tank_full_of_water.pdfIn PDF document text
    • http://surugen.epizy.com/59245384520.pdfIn PDF document text
    • http://wivonuwexewixir.rf.gd/carbon_footprint_journal.pdfIn PDF document text
    • http://bilopijubebuji.epizy.com/burmese_language_basics.pdfIn PDF document text
    • http://batubegirego.rf.gd/zelom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edfcde1-116e-45ec-abc8-d2cc6748929b/in_christ_alone_passion_piano_sheet_music.pdfIn PDF document text
    • http://xadoteditopuse.epizy.com/estrus_synchronization_in_cattle.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/aashiqui_2_telugu_movie_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/63497096958.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_off0002b079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B079 5604 bytes
SHA-256: e71082fcd044bcfd17e114ac0e6284f1e816886ec1dbc528babb21ea4050fc1c
font_01_sfnt_off0002c38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C38F 11488 bytes
SHA-256: 02d50d054ac210e2bdabd2a7aee1d3db87725e5d4a3b804271c2bdda7ac91d61