Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd44a44b4123c3d…

MALICIOUS

PDF

76.6 KB Created: 2021-04-19 18:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 641f855a6bf5ec37baa883cb11c91393 SHA-1: 5d210e5169a9912bd573b77b8792ae437e89f223 SHA-256: cfd44a44b4123c3dfa52465e2f39f661d0f51e461a318e4cb67203ce3040b8b8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://gimoguvi.ru/strik?utm_term=cyberpunk+2077+release+date+playstation+store PDF link annotation
    • http://fejukoturig.medianewsonline.com/usps_postage_rates_2020_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_606cc99f179d6.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://xalebiru.iblogger.org/99725034263.pdfIn PDF document text
    • http://euromarket.pro/11101310800kxkbg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485572/normal_5ff9b8f58c190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415519/normal_60035710912d8.pdfIn PDF document text
    • http://talakam.space/shelter_island_san_diego_map51s8r.pdfIn PDF document text
    • http://gta-msk.ru/what_are_the_disciplines_of_psychologypn98a.pdfIn PDF document text
    • http://dexiserabasavo.mygamesonline.org/paleontology_mcqs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_6012459ea212c.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/psychology_of_love_by_sigmund_freud.pdfIn PDF document text
    • http://jakiduve.scienceontheweb.net/l_adjectif_numral_cardinal_et_ordinal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/synonyms_antonyms_homonyms_worksheet.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_d4d4ea4c972c4be6a48f9402e5211362.pdf?index=trueIn PDF document text
    • http://puvapulugo.onlinewebshop.net/application_support_engineer_interview_questions.pdfIn PDF document text
    • https://90e68d66-75cd-4f9f-aa76-03b1e6b67b4d.filesusr.com/ugd/324cd8_31fcc63cc9654c8eadcf73e38fe5559e.pdf?index=trueIn PDF document text
    • http://birotizedu.epizy.com/ritozesawegis.pdfIn PDF document text
    • http://notufexunu.rf.gd/how_to_fix_an_emerson_tv.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_f96ca339ecec4e24a2043940b9cfe972.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_c616dc4b1f854616a83511ada8a73254.pdf?index=trueIn PDF document text
    • http://kugesiv.epizy.com/washington_state_university_address_for_taxes.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_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 5516 bytes
SHA-256: 46c3627e56c3c45fa111ccb70becb7c4da59c2e8793c73e6b464c1f064bad443
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 12412 bytes
SHA-256: 149b162cdb994a0288d2e83c450835daaa5d9dab960c3569160182239bc8225f

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