Malicious PDF — malware analysis report

Static analysis result for SHA-256 78533207ec720b43…

MALICIOUS

PDF

83.8 KB Created: 2021-03-06 18:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b343c7f687e8fc0d96b56a8076985b23 SHA-1: 1620002d045539e64f37d1dba42767126b433ac3 SHA-256: 78533207ec720b43a45f4792d6581ae4a8106ddf5f2b19973178d96a81a9a77d
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-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://dafemum.ru/wix?keyword=tv+guide+listings+erie+pa PDF link annotation
    • https://cdn.sqhk.co/kisasizaro/Ygfhfhe/shooting_games_for_xbox_one_2020.pdfIn PDF document text
    • http://pewodaz.22web.org/c_winforms_bind_textbox_to_string.pdfIn PDF document text
    • http://vostokzapad.su/35003453809u12jb.pdfIn PDF document text
    • http://santand-es.com/formato_de_mayorizacion_en_excelbgbkk.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/hcgdEhi/move_to_ios_app_download.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/e6322b05cd48.pdfIn PDF document text
    • https://botakukejase.weebly.com/uploads/1/3/4/6/134610266/manirezajux.pdfIn PDF document text
    • http://manovina.mypressonline.com/nepumozuzipewakafiduvirul.pdfIn PDF document text
    • https://jaligudupu.weebly.com/uploads/1/3/5/3/135391073/9652363.pdfIn PDF document text
    • http://triple-doska3.club/zanizafogodijeklffw8.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/Mghdigr/9298219740.pdfIn PDF document text
    • https://sujabowumosof.weebly.com/uploads/1/3/1/3/131398195/0395fe7db62.pdfIn PDF document text
    • http://padlamadla.site/ikea_water_glasses_australiagqxus.pdfIn PDF document text
    • https://cdn.sqhk.co/biloriput/ajcjdyv/among_us_imposter_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/hdNBhbM/yandex_reverse_image_search_firefox.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/diary_of_a_wimpy_kid_1_full_movie_watch_online_free.pdfIn PDF document text
    • http://kyrgyztours.com/76751372069agtad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dirunexodov.rf.gd/intermediary_guidelines_amendment_rules_2018.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/24884552423.pdfIn PDF document text
    • http://sebubexegan.rf.gd/tenths_and_hundredths_worksheets.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_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 5136 bytes
SHA-256: 4e55f73263557723e4f852445b970bb57e5bdc0dbf184c8087ade30aba350cc9
font_01_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 10240 bytes
SHA-256: 7ec000f4269640ae2ac116b103a7b3a0c5485154ccaae6101dbfdd098b3f5cf5