Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0124ea1ff8eb158…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 00:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63d1fed9381336ab8a60708790d2ad4c SHA-1: 376ddabf38e131db39ff24f0e126d3515f19f378 SHA-256: b0124ea1ff8eb15873c166bd71ba3e7c73570dd2e8497e95120741b95f20856a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic flagging it as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and URL distribution suggest an attempt to manipulate search engine results or distribute further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://okna-stv.ru/userfiles/files/tubamob.pdf In PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dogin.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/33720088363.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/kugipa.pdfIn PDF document text
    • https://anandalaya.in/resources/file/pukim.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/kagekixevavojipamakepog.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/fojavilifisax.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/mukujiluvisezivogote.pdfIn PDF document text
    • http://prestopc.it/upload/file/xuwanudeje.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/toligivoragibomof.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/kudasebofosutelubamuv.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/fijina.pdfIn PDF document text
    • https://swiz.eu/files/editor/37620729251.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/bewipububuzi.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/vipofikezaf.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cef0913fe1---76452724191.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/59856686613.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9317e3da---kuzawasibuzid.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/89332232916.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/88318564034.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/kivijebubodigonubo.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/linumetov.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/82732680919.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/51052433560.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/losamezamogalazur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=play+store+does+not+download+appsPDF 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_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 10492 bytes
SHA-256: a344a7de3eb9950507f4e41dfa2df800f32e8da3b9c78b3eda1f5f41431740c4
font_02_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 17612 bytes
SHA-256: 1b41430d23e32274ffda2f8de6c331383c8379c2e1aa1107dce279b039963385