Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf09714ec105fb8…

MALICIOUS

PDF

68.6 KB Created: 2021-10-02 22:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 379506f01719c7c12968466900d64b43 SHA-1: c99671956fda132d9381f2d2c779842b38f601a9 SHA-256: daf09714ec105fb8daf2ef31244059a1697d1df1a53cccbca4cad318e3c38b5c
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by an ML classifier and exhibits characteristics of a phishing lure, such as an image-only design with an action trigger. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. No scripts were extracted, but the presence of external URIs indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://miass.realxenon.ru/uploads/files/lamonezaratatufodufigedo.pdf In PDF document text
    • http://immobilieninvestors.net/userfiles/file/pinogumakepototefuful.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/91949029870.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/57683578750.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/52182724061.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/bagozukimogisanizemalep.pdfIn PDF document text
    • http://marketingnews.fr/images/file/82526089040.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/19240807562.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///foral.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/88782359721.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/vivotekonadudu.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/pejadojedebixuvaloku.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd5dac1d94---76468235774.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/22462355249.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/91194158439.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/de7e28354846165d6c6cc89ddc0b920d/selufuj.pdfIn PDF document text
    • http://saimiri.name/upload/file/144219201.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/45704255444.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210907064630.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/81561121996.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/xokagatatugaba.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/1469876942.pdfIn PDF document text
    • http://ruihuitax.com/files/file/20871860422.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/jovixewiselebomuwedibaxaz.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/koziwitiwuk.pdfIn PDF document text
    • https://ags-car.com/upload/files/16961019498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=iphone+5+user+guide+pdfPDF 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_off0000b0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D6 14376 bytes
SHA-256: 9dee2a0c670587fadfc986c81a3438f4310ec57dcd3a252a655176cc6d3fa79e
font_02_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 10656 bytes
SHA-256: dc025bb46cea1c506297ec77a6c6f492e2134a1d83595f8389bf244bc58f2789