Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfeb85a3ad5c9424…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 00:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d71ad277e39d318f64b9a40a30ddc4e SHA-1: 5bc1983d9adfe1468fb26ae1d437c96eb5ba239e SHA-256: cfeb85a3ad5c94243dc121d86b28d247a18b8a74f307595b7a5fc3cec28f4604
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of links to various PDF files hosted on different domains, indicating a link farm designed to obscure the true malicious intent. The ML classifier and ClamAV detection strongly suggest maliciousness, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://serrechevalier-skifun.com/imagesfile/6796995467.pdf In PDF document text
    • http://bhk-aindling.com/userfiles/files/virezogodenijaxu.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/93243462067.pdfIn PDF document text
    • http://hotnews.md/upload/userfiles/files/59338781057.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/zegelapam.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/93406764165.pdfIn PDF document text
    • http://lecostationery.com/files/file/88443143300.pdfIn PDF document text
    • https://digireg.cz/upload/zudafuxododevoriro.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/21772583443.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/74486193984.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/pabuta.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109101357445160.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/98101599198.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/79865988165.pdfIn PDF document text
    • https://mahae.hu/files/files/gigopugexozozubas.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/81283521002.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/dutafurixezagokon.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d07ba5af8---17852840491.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/79188936135.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/vijexijezukakasuzogifumix.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edff407cd2---wosidasolozu.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/woborofukudezaba.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/nuvavipid.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/soxekalomuretomupeduwo.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/donapepazasisinabikosetir.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-4/20210904170627431920.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/wukepasalatu.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/54898883578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=weather+underground+android+apkPDF 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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 10644 bytes
SHA-256: 76061035d970e24d0a3c2da52e496f8f697e5d8b83f3a236776f6dc3035ea75b
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 18400 bytes
SHA-256: d10e7d5ca7f62342e38e13f4a095510b3beacad36b34cc5171705d083fcfbd98
font_02_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1