Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e64922c43b5756…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 03:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ca0043abd7a696760f8c8d6a60b6ae3 SHA-1: fb5bad6de8e33a91181d791a7ef9f214433f1a5f SHA-256: d7e64922c43b5756a05543f3188399c3d22d8497ef0db666cbcd31237d0495e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, flagged as a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://drafthe.ru/uplcv?utm_term=student+solutions+manual+study+guide+physics+for+scientists+and+engineers+8th+edition PDF link annotation
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/6f6331a5a65a8d5394a35407970fa99b/41108371502.pdfIn PDF document text
    • https://brukspec.pl/upload/file/26664448884.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/10924560500.pdfIn PDF document text
    • http://klaaswester.nl/img/file/69843024205.pdfIn PDF document text
    • http://offerparts.com/upload/files/dibuzosibilezog.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/misimirefokorawesogasib.pdfIn PDF document text
    • https://promise-land.com/upload/file/fotilijowikumopufefo.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/zubuf.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/bemimo.pdfIn PDF document text
    • https://vleek.com/uploads/files/levuged.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/12823025635.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/nomifiwi.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/rimuroxijiwikolikibe.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/42689001264.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/getawufo.pdfIn PDF document text
    • https://kermanrooz.com/img/files/25126056464.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/razukaxesoniwivemod.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/69156409593.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/vajed.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce01892a2---sulesodosetu.pdfIn PDF document text
    • http://industrialdevices.in/uploads/retimezawilap.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/33103591171.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/72316620349.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_off0000cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 11564 bytes
SHA-256: c8ea150802d58057ea3f639654018a99d1d5c40af3917a0a9ce2e198cb23e17c
font_01_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 17384 bytes
SHA-256: 48dbbb7fc5fcadd907443a5fc288f3ef1a429004007e4c4562a7eae4c9f633f4

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