Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2ee3ceff72826c…

MALICIOUS

PDF

80.0 KB Created: 2021-04-07 19:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 9984009866098ee7a697e0fe9093f099 SHA-1: 2e261660d10890447e84998c7d02306f4cb2b2db SHA-256: 8a2ee3ceff72826cb5adcd51c6ebbdae19430046053f677fca1a61d858d95524
186 Risk Score

Malware Insights

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

This PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body, though heavily obfuscated, contains a title related to disconnecting a security system, which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=how+to+disconnect+a+brinks+alarm+system PDF link annotation
    • http://nadixonoju.iblogger.org/libatitupiwenuw.pdfIn PDF document text
    • http://fuxewofuwikafu.iblogger.org/nhl_concussion_protocol_2020.pdfIn PDF document text
    • http://xerijegodufiw.mypressonline.com/44344232911.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/48829488046.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/52124829032.pdfIn PDF document text
    • http://xizapataruxeku.mygamesonline.org/latojevesaduwoxerive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://figofubinodafe.rf.gd/email_template_for_school_admission.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5914fa5e-8ac8-4898-9f2a-1d642dc5fd69/nine_algorithms_that_changed_the_future_by_john_maccormick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d4e095-7102-44eb-ac8f-5fd4f3a945c6/xomezuboga.pdfIn PDF document text
    • http://gaxomin.rf.gd/foxovuzubufejajodomokiruf.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_3d84275fcf3a4ae089774f47eb17c251.pdf?index=trueIn PDF document text
    • http://voxotili.epizy.com/54625169435.pdfIn PDF document text
    • http://lotidasifiteg.epizy.com/analytical_thinking_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0c3190-b382-49ab-9b35-97e32a8dace0/46114526854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92436769-c347-4ece-b840-c311feefdfe0/can_i_get_a_job_with_html_and_css.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/arrabales_de_leningrado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfda00e-30ca-42da-9bd9-ee022fba6852/5581031043.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_ad8c02bf6d5f41acb58f070c3af7286e.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_fcaf2c761eec4f599d666704bbc4a243.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/320b19d8-f5e1-41da-b107-e5093b3795ef/washington_dc_airport_american_airlines_terminal.pdfIn PDF document text
    • http://medipebep.rf.gd/59569561246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca257d0-177f-44af-80e5-768f1a69bdda/is_the_revenant_on_netflix_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2a2327-6187-45e3-9c7c-b76115c20f5b/lasebokesisiv.pdfIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_7d316c93a91845e18b60107e850efeb6.pdf?index=trueIn PDF document text
    • http://romepasuv.myartsonline.com/history_of_the_bible_timeline.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_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 5444 bytes
SHA-256: cd76c5bb20c54f2e6dc2190760ef86375a12e0f47550839457f80bca36c90897
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 11308 bytes
SHA-256: 91cd5d4ccdc05c56f421414470a38c488fed8e3ad357fe0b820c1edb2ed5562d

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