Malicious PDF — malware analysis report

Static analysis result for SHA-256 152ee5a2cfc2fe65…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 11:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 237e9280641d54b32b406f114ca675b1 SHA-1: 0e48d18ed840845ec123229921d4bf051d7f4afd SHA-256: 152ee5a2cfc2fe65529e1b9591f3059dde9807a2ebe4c6f24b765df0a6a39369
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish credentials through these links. No scripts were extracted, but the presence of numerous URLs indicates a likely attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=extreme+car+driving+simulator+hack+mod+apk+download PDF link annotation
    • http://ecohost.ru/pics/images/file/38081272770.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/43779736230.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/89469198565.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/10579346044.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3036865e---20052340178.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/44340162411.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/naduped.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ge8qlu4p0g3jcatjpuqbm4folh/nesemusememivuwego.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/44219330601.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/64819106559.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/vegepajas.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/24867203148.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/mosaxul.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/26026828113.pdfIn PDF document text
    • https://pellevah.com/upload/files/74032469856.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/41821076895.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/17140088560.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/85051897082.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30976839768.pdfIn PDF document text
    • http://ipceurope.com/assets/file/80941960971.pdfIn PDF document text
    • http://epmachine.ru/d/files/1378524251.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/magesoxem.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_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 18180 bytes
SHA-256: c5a6bde833dab64e50180ae60c217cf8f3bae208d93e632b00393b73d9b4441a
font_02_sfnt_off00012f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2A 11388 bytes
SHA-256: b12c6300d77845d58f0972320754e6bdc12c2a5d1e25b51b10045de623983396