Malicious PDF — malware analysis report

Static analysis result for SHA-256 849b37138b09b075…

MALICIOUS

PDF

87.7 KB Created: 2021-03-14 12:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 13e30fc730a49524dba47bc97757cbf1 SHA-1: 992fac9a80c4d1d8a605d9c37ba7eb5a8d230ec6 SHA-256: 849b37138b09b075b41526576de2325127ecec290c300895b91f6c1959890637
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 0.9955

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://fokemale.ru/wix?keyword=kinh+xin+khan+cha+truong+buu+diep PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452206/normal_604200c3ebbe6.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/what_is_the_tone_of_a_poem_examples.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/faduriliteboma72zlq.pdfIn PDF document text
    • http://rasazevedip.22web.org/semekuriridufirorijowome.pdfIn PDF document text
    • http://senteber.site/tojurugajewowacwt4l.pdfIn PDF document text
    • http://mastera-saydinga.ru/all_of_me_violin_sheet_music_for_beginnerse9msl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480402/normal_5fcb17b1452cf.pdfIn PDF document text
    • http://alteramaks.world/what_are_the_types_of_editing_a_documentw85ub.pdfIn PDF document text
    • http://funseeds.site/continental_drift_activity_worksheetkll7r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_602f2f680e1e5.pdfIn PDF document text
    • http://vonowaz.iblogger.org/66617944737.pdfIn PDF document text
    • http://ketuzel.22web.org/solucionario_quimica_organica_wade_7ma_edicion_volumen_1.pdfIn PDF document text
    • http://bikokobolo.sportsontheweb.net/lizabovizapose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_600be891bb82d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://savejanaxejov.rf.gd/journal_of_bioscience_and_bioengineering_author_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d8dc7f-1e88-4fef-8bce-7e2126ee494c/63977013852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2b06d3-3769-477d-a904-b13fa65e48e6/bimofoguvenikujip.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/lakefununutabikig.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/irregular_verb_list_english.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/gi_tract_powerpoint_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5450a9-2451-4beb-8bad-f4a6159c0de6/92906240083.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/55441964900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf129da-ea2a-480d-8070-326ea39a4f0d/43922537860.pdfIn PDF document text
    • http://xegubidutanaza.epizy.com/minnie_mouse_bow_template_vector.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/can_you_eat_pickles_on_10_day_green_smoothie_cleanse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0b7197-9727-413b-81e6-e0d0f0c1d043/4355953595.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_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 3456 bytes
SHA-256: 60da634f237411708e28c8b6cea6266ce72f8e21039994e129d0cb0fedd5ea39
font_01_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 5368 bytes
SHA-256: cfdaee4df5ba9351afffdf233f11fd6d4f309422511ae33cb5aa2411d0395016
font_02_sfnt_off00011d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1B 22676 bytes
SHA-256: f395062042cca42607a65a1808db4e65f8c2229b4d10bb5cb69268c2f71cb290