Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1109a7255fa28dc…

MALICIOUS

PDF

92.2 KB Created: 2021-09-11 05:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5829cd3b62fd36c537e3fef5b51fb8c0 SHA-1: cc69272b21ddba675ac726f6d0bc26eb75832cd1 SHA-256: e1109a7255fa28dcfdfaac657c2513c5fed02f1a235223bd1a96f92a1bfdb2cf
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be directing users to a large collection of other PDF files, likely for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 4

  • 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 http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210908_8557DE30B327CF07.pdf In PDF document text
    • https://egyiksem.hu/uploads/file/39199229661.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/61560268123.pdfIn PDF document text
    • http://ruihuitax.com/files/file/93112852655.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210906225656.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/12558640426.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/lonixokefixapufukajid.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/37692534563.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/kajapamemikeb.pdfIn PDF document text
    • http://onelove.cz/file/wudesanabuvifavejir.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/favosodemukubewowemes.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/72154980220.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/batetuzesibawesudapolu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/dakugirewenag.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/68957710231.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/gakaxodenotomek.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/jojopumazak.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12b88e48e---kuvufilomojerefota.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bomazejode.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/26357638686.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/tamajupapipimeduxaxuzozeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=putlocker+123+moviePDF link annotation
    • 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_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 20492 bytes
SHA-256: eaf704f020c9f6652e4e462b9ca9c87aa803fc488da5ec0ff2ac64b318866230
font_01_sfnt_off000132e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFF 10560 bytes
SHA-256: 1e91435708fead53feaa40a12edc0a2f1240a04500cd1dac32cad84e370c73f3

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