Malicious PDF — malware analysis report

Static analysis result for SHA-256 a172c23d55ccea80…

MALICIOUS

PDF

76.7 KB Created: 2021-02-14 21:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 07f018c32511c7896d0725b12fef3c2c SHA-1: 4cd662aff75a51d0bb0b2d656ff64d438ac08991 SHA-256: a172c23d55ccea80af9d6e5680cf02f0d6d9a85a0ca276b90813043531d00c04
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing or malware distribution technique.

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://bologen.ru/wb?keyword=chopin%20waltz%202%20sheet%20music PDF link annotation
    • http://4kuhd.me/mystic_messenger_707_route_day_6d794c.pdfIn PDF document text
    • http://f13x.xyz/xepamuksn6q.pdfIn PDF document text
    • http://reassurez-moi-fr.info/do_re_mi_lyrics_sound_of_music7c019.pdfIn PDF document text
    • https://raralulewuk.weebly.com/uploads/1/3/4/4/134478892/735436.pdfIn PDF document text
    • http://rabota-plus.club/street_racing_car_traffic_speed_mod_apk_downloadpudzl.pdfIn PDF document text
    • https://luvemolovod.weebly.com/uploads/1/3/4/3/134305721/xesag-gubixetejona-wimujolajuxiga-xuxubixino.pdfIn PDF document text
    • http://winclean-shop.space/workout_music_90s_rapx1f8a.pdfIn PDF document text
    • http://kernig.online/autocad_for_mac_os_x_10._6txgrm.pdfIn PDF document text
    • https://gulapekojikag.weebly.com/uploads/1/3/2/7/132741551/ace3df3e1037f2.pdfIn PDF document text
    • https://gumijunu.weebly.com/uploads/1/3/5/3/135399233/fiponubex.pdfIn PDF document text
    • https://fikanofuzak.weebly.com/uploads/1/3/1/4/131438747/fa61c92.pdfIn PDF document text
    • http://timurberg.ru/catbird_agency_submission_guidelinestgdll.pdfIn PDF document text
    • http://xsafak.com/25588691879zz9ig.pdfIn PDF document text
    • http://zivudib.66ghz.com/sarcastic_answers_for_how_are_you.pdfIn PDF document text
    • http://100p-f.ru/exercice_vitesse_6eme_physiquehjbs0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xufoxorog/hiv_test_report_reactive_means.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/39401038278.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/indices_bursatiles_del_mundo.pdfIn PDF document text
    • http://kudawarov.epizy.com/jukejisixofilewamepuno.pdfIn PDF document text
    • http://zinizebaki.epizy.com/rofoponusipereperefuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 5256 bytes
SHA-256: feaa16f4e156e05b34dd8cb707e29958669242ed915a1842a2ff78cdfe492ae0
font_01_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 11620 bytes
SHA-256: d4b1d087d4915dff063d3ec07cce2116aa3fee672779a9eec5fffc42ee355216
font_02_sfnt_off00011750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11750 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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