Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05d6f10596d4562…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 11:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1aa7000484b851e0abe14336cef1c257 SHA-1: 4de13ddd3d522c24236b31d0564a71936ae0e6fb SHA-256: f05d6f10596d4562a9b2ba0018a5a578f6a5df80ab7b7571f9263ee5d2a3cb28
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files hosted on potentially disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://weifong.tw/fckimages/file/19490489763.pdf In PDF document text
    • http://svb-volleyball.de/userfiles/file/wonodurivifolotisaze.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210912203304.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/wadumilawegujona.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/wiluwomujopizad.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/fuvabuvabiraw.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/24373565319.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/pibuximodagiwogurulalimuf.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/22091434741.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/fajilabudin.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/warepeduxot.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/wofinara.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/mabowagavopavevataboxaf.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/95147827915.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a12357df92378118c780e10057a72c63/78222581775.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/pokesizedaretiguwulu.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210910192015.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/17494909192.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/depumezujuximibovinimenuv.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/91423291399.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b091971f7b4d1e15f15dd9ba6bfd9dbd/42040424737.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/dizadamijokuwozelonop.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/5514995364.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/luxibavuwuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=aot+2+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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 16692 bytes
SHA-256: fbe862455593489c99941de76e45b54af518d5e336daade3c8d79811a878d683
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 9796 bytes
SHA-256: 04f58024737061bdfe59f686098cec575a63155d7becee6893251ed8be8b4cc7
font_02_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1