Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7657f0c47993555…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 06:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8034db6a1b8dde218b3c3fbca225bcc9 SHA-1: df8bf64ff3a694aad4ee838c69f3bbaf78363ab7 SHA-256: d7657f0c47993555b659f782a62dc7ebcf1c6928ef9108eb4e03257e872f7a4e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of embedding many links on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the presence of many external URIs points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dreamscapes.ca/dream_scapes/userfiles/files/lofufedapabemasitowi.pdf In PDF document text
    • http://7m-shop.com/userfiles/file/tamoradenevovonuj.pdfIn PDF document text
    • http://rentaruedas.com/files/others/57684209420.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/48ab093fb6ee8df78b9c1093cc269a66/45103527604.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/womebolexediw.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/figinuduganaw.pdfIn PDF document text
    • https://papiratisk.cz/soubory/foforabupajit.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/melixizekifotokubabetaped.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/wisitolatidonagakugid.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/6984726934.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/49714064943.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/41852491175.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/4583534335.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109081903038132.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/2656704183.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/45093297952.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/wakanofid.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/gunasomedukibivefup.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/nasavepiwabunoja.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/58154908522.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/ximakexexodotodeva.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/15455221131.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/faduxufawovajizuzasixitu.pdfIn PDF document text
    • http://indemo.pl/Image/files/22585111439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=frp+apk+2019PDF 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_off0000b2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E8 17100 bytes
SHA-256: bafce307a6db5ee338d640c4617c87f12b3ff93fe3aba3fb5758fc156c3cbe4f
font_01_sfnt_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 10016 bytes
SHA-256: 0bb59434adb67310adcb07a8b486b6da057290d2e93c5077489193d9bd0bc6a2
font_02_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1