Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63ce009fec53422…

MALICIOUS

PDF

86.1 KB Created: 2021-10-23 03:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 52b1b05c24a38b813f4c14c804955dc8 SHA-1: ae068393c933e0ff262143042086ce43f9ceb68e SHA-256: a63ce009fec5342228bcf5d60b2666f70c619db8dbee129b4fb55b5c60b417a9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to other PDF files hosted on distinct domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's part of a campaign to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://hamasataccessories.com/userfiles/files/6937530686.pdf In PDF document text
    • http://intertexmedical.com/userfiles/files/mawonutamudexogu.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/novuxosaxexojovo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jozalalawalabokinim.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135a57248dc4---zupafadizexalozo.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/vusog.pdfIn PDF document text
    • http://garderoba.sk/images/_file/18237473107.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/67826329266.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/bovusamiz.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/vibunujorududul.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/4920778755.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/7817265092.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/xuguvijorepogakox.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/53611313104.pdfIn PDF document text
    • https://unosms.us/userfiles/file/difes.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/7016729371.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b79b07e554---bumasavoxurozusu.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/18680004502.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/49218354718.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/17841365738.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/32587615584.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/jevarazopemuvelarorotudo.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/jariwukajamosabum.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/91733581742.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1634213011158bcb0e3e70a3827221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/EqozwcbAC44/uplcv?utm_term=the+commercial+butterfly+breeders+manualPDF 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_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 17940 bytes
SHA-256: ca6f827c3e60a30542db8ff45444c4406b486a247a1651a825e216e366fc5638
font_01_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13164 11060 bytes
SHA-256: 6727aec62022abe527e6866e9612f7f5726b93dd0e830e8e11ca5445deb4d1a0