Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1a1b60c27d1485…

MALICIOUS

PDF

76.1 KB Created: 2021-03-28 00:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92cf6b0e57ab7a77e85733a9de0827a1 SHA-1: ec5af667ecfe6b873f477586b137ea628a1152be SHA-256: 7d1a1b60c27d1485c16377a2dd1c524afae9c65b7d29da2f4e9a40514d168447
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to obscure the primary malicious URL. The primary malicious URL identified is https://mezovuduw.ru/aws, which is presented under the guise of a gift-wrapping tutorial. No scripts were extracted, but the presence of numerous external links suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/aws?utm_term=how+to+wrap+a+present+with+ribbon+on+the+corners
    • https://cdn.sqhk.co/pasezateda/dqCthYp/milafoxajunojomaguj.pdf
    • https://cdn.sqhk.co/xifusajexom/fNhb5id/bazidas.pdf
    • https://cdn.sqhk.co/bixatavafut/Phi331j/zuxawisukenetunun.pdf
    • https://cdn.sqhk.co/feruwapusux/QgfdNX8/vertebrate_zoology_book.pdf
    • https://cdn.sqhk.co/tudenireso/dJ3ihgi/instagram_apple_watch_5.pdf
    • https://cdn.sqhk.co/budajawisore/ZjgiQhj/92415813019.pdf
    • https://cdn.sqhk.co/juvanejejuwo/hiYjhmk/clash_of_clans_dragon_attack_th8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8d010e0d-72fe-4b41-a24e-b11fe8b1074f/54739934402.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/como_consultar_reportes_en_centrales_de_riesgo.pdf
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_680b8f9f50c14521bd1d4d91eaa0cbb0.pdf?index=true
    • https://s3.amazonaws.com/wazagidonux/proton_vpn_premium_cracked_apk.pdf
    • http://demunoj.epizy.com/lease_agreement_example_template.pdf
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_e88b691b26c3414fbdf45209f703537a.pdf?index=true
    • http://lafuworukegi.epizy.com/xapimeseganifukapinaxi.pdf
    • https://uploads.strikinglycdn.com/files/271345a4-f504-4525-87cf-168432897343/goramugigun.pdf
    • https://uploads.strikinglycdn.com/files/ceaebb6d-7892-4ab1-b36f-6bf1436470d5/how_much_weight_can_a_8ft_trampoline_take.pdf
    • https://uploads.strikinglycdn.com/files/f6b38c8d-3daf-48ae-9f03-7637016520fe/american_safety_casualty_insurance_company_phone_number.pdf
    • http://xevezowa.rf.gd/rudram_namakam_telugu_download.pdf
    • http://fawamoru.rf.gd/clasificacion_de_la_administracion_publica_en_mexico.pdf
    • https://s3.amazonaws.com/tobaziw/monitor_de_ritmo_cardiaco_fetal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1a.bin
22fbecd54d08b5082e1e688f46c892815359f59dafd41b22c6ddc8545d34587f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 5184 bytes
font_01_sfnt_off0000fec1.bin
4bc4c81b597145e583a8414c500559395e885aa7908eea462145c0c40a6841af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 10612 bytes

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