Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7d4e0edc96315f…

MALICIOUS

PDF

67.6 KB Created: 2021-02-21 17:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e30439fcf5b500981b04ee9bec51c017 SHA-1: 0dc47dacda0391faa10be89d71a5318be195a637 SHA-256: 3c7d4e0edc96315f3a2c10e854b1df740d3bc35421e125bf35731a93b5443826
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 0.9998

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://jacksth.ru/123?utm_term=avent+steriliser+user+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411500/normal_60154d0b4d537.pdfIn PDF document text
    • http://venira.su/avengers_4_movie_in_tamil_hdnnm00.pdfIn PDF document text
    • http://podarokinsta.site/hungry_shark_evolution_mod_iphone2zb8y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447087/normal_5ff69c2cf05bd.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/i5qfvRe/rejovuxezubufot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_601b3612bcec6.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/ih24jch/slytherin_robe_female_official.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/hgiChgo/perfect_ed_sheeran_piano_easy_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/iV3i1ij/hp_print_service_plugin_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_601952b782409.pdfIn PDF document text
    • http://pedalini.club/17587590449dari7.pdfIn PDF document text
    • http://bufo.online/how_to_download_pokemon_insurgence_on_androidk4pge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mixomexazuvoxod.rf.gd/tamilrockers_movies_telugu.pdfIn PDF document text
    • http://xodupope.epizy.com/baby_shower_invite_online_template.pdfIn PDF document text
    • http://soxuxemakim.rf.gd/xemurodofoteranosefeme.pdfIn PDF document text
    • http://tidewoxawutose.epizy.com/dancing_ballz_mod_apk_1._4._9.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_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 4832 bytes
SHA-256: 1fe106aa1f7ef112c67156c60cfa6a9c2c678f4c5b6ffd93aafa808111054292
font_01_sfnt_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 10544 bytes
SHA-256: 8d2b40e7da017b9f4339ff1c1cf53a4dd5e9430c3557c102b9e46033c8ce4408