Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2160d0e95b6170…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 21:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87b4614bf1e03db51a3615a81f3c2c46 SHA-1: 234810116af2a6dfadcbd7f7371acaf5966e48b8 SHA-256: fa2160d0e95b6170309489f8bcfdf101ed829332c88c7b1e97c314084ff0ce24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=henry+the+stickman+unblocked PDF link annotation
    • http://klpa.net/userData/board/file/67204840510.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/jizuvinel.pdfIn PDF document text
    • https://diphong.com/uploads/sefowogujoxatolomesix.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109051624071173.pdfIn PDF document text
    • https://tierlistei.ch/downloads/32637061485.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///16379395805.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/bisuxozubelamozukuxelit.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/50011834462.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/nakisopef.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/janudofif.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/56553824004.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/kuvujubejevepodurigin.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/9744201316.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9991a24f35c00a8e1902ab2b25e83c54/3328033476.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/10947342692.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/jozikogetik.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/45537735575.pdfIn PDF document text
    • https://0900107678.com/upload/file/rawasamamujopagifivapipo.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/tadekevorefeleredit.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/nixovewufi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614310430c7b3---63059588093.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/dofupedijomole.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/74575312157.pdfIn PDF document text
    • 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_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 11072 bytes
SHA-256: 4eda1ed2e1932f7d8b9e2ec9b55f381b7815fb5e1a49250e80393fc773994294
font_01_sfnt_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 17588 bytes
SHA-256: dc915583e55682f10fcc12a737afab3fc16525a85401e1d63695cc6b180e4857