Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd81021f7753cdfa…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 11:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7236767603697f5162eb5d1cedd50f18 SHA-1: ad07261c8775d3fd9e766cf401ac3ad4a2412aab SHA-256: dd81021f7753cdfab1a93bc9585ce050cdba5dc9a0f1065facd7df4f3ee068a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly indicate the PDF's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=best+slideshow+maker+android PDF link annotation
    • http://clean-ecology.com/Upload/files/lejugazuxidabamokumuvesom.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/81623481245.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/80359007048.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/wiloseseletiseluseso.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/zipuxomitumosozizop.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/11938206966.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/felubinav.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/85637661959.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/sigalume.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/zekagadabamajiwoxobuzisu.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/vipikobibeboxuz.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/fibabiruzazofogajir.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/lovuvus.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/7029867925.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409f638b079---54918876154.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/fifedefakemuvidu.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/16655628141.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/fowikaxoxuparilixi.pdfIn PDF document text
    • https://birotex.rs/images/files/39387361781.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///2947552593.pdfIn PDF document text
    • https://soechi.com/userfiles/file/fowizibakutozuxateruxadov.pdfIn PDF document text
    • http://www.77ice.com/upload/files/82380045710.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/jegazupowegekil.pdfIn PDF document text
    • http://vipdiler.ru/files/file/fokuroko.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 16876 bytes
SHA-256: 42aa13bf16215a2a187cc94dd5c3b93b100aa434e3183c61f652e7fc18e10d18
font_01_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 10744 bytes
SHA-256: d269d7f7be20be164f929dad9868e51761cf459ea20aa84f153ce7246df5ee6a
font_02_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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