Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5948cb6342af20c…

MALICIOUS

PDF

78.7 KB Created: 2021-02-28 22:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3ae330971b3c7ebdb4698e42f76ff014 SHA-1: 206b99c7e599e4da41981df2843b77760b035bbb SHA-256: a5948cb6342af20cee0695f2e733b50b7647a3a8607985b9b8065e7fc123581b
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://druttle.ru/wix?keyword=san+andreas+mod+apk+android PDF link annotation
    • https://bulasekujamur.weebly.com/uploads/1/3/4/3/134377464/vewijubituzokekuk.pdfIn PDF document text
    • http://freefire-gifts.com/diagnosis_and_treatment_of_chronic_kidney_failuredt9bt.pdfIn PDF document text
    • http://help-verification.com/starbucks_barista_salary_ph_part_timewxb9w.pdfIn PDF document text
    • https://bemofoserobonuw.weebly.com/uploads/1/3/0/7/130739893/milupufiku-gutino-fawasuxu.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/minecraft_survival_servers_ip_1.16.2.pdfIn PDF document text
    • https://vavaxumepanev.weebly.com/uploads/1/3/6/0/136097425/pagulowup.pdfIn PDF document text
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/a6676e419025d.pdfIn PDF document text
    • http://whysmall.space/google_sheets_annual_budget16gpg.pdfIn PDF document text
    • http://giocodigital.fun/zesuxeztgbiq.pdfIn PDF document text
    • http://wapajag.22web.org/is_the_sheriff_of_nottingham_real.pdfIn PDF document text
    • http://zifasito.22web.org/wired_xbox_360_controller_pc_flashing_green_light.pdfIn PDF document text
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/jerepojusawejiz-zedopilawis-fixenavomuvoze-jiduba.pdfIn PDF document text
    • http://boxoxele.22web.org/79605839324.pdfIn PDF document text
    • http://vclean-sale.shop/mera_bhola_hai_bhandari_ringtonesz5b5u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zopegekole.rf.gd/wulemogi.pdfIn PDF document text
    • http://xesufiwonelu.epizy.com/what_trucks_will_be_at_monster_jam_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/certificate_not_from_trusted_authority_android.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/lumoxamosidebemisi.pdfIn PDF document text
    • http://wemikovovafebo.epizy.com/clcss_subsidy_scheme_guidelines.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_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 5240 bytes
SHA-256: ccd8744577fcedb2048facef22881c0dbb3c4f3d247835a6aa5f3d45e28f2158
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 11396 bytes
SHA-256: cb42d80f243ed79dabe108585f3c2501e8709bffa2333f8c9a764832eccfcd20

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