Malicious PDF — malware analysis report

Static analysis result for SHA-256 2444cf83355efcd8…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 09:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc80771ecc3e7bac91b5006056392189 SHA-1: 35c067bf04342add90b44adcf0187af94c59391b SHA-256: 2444cf83355efcd8ea5f9b615bd99336f3a65e04497746b9f4200f7e366ba994
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 embedded URLs, many of which point to distinct domains, suggesting a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to distribute phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://jrmhandling.nl/upload/file/bukiruli.pdf In PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/ziwujometopunuwosedewogux.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fadoluzalexu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/eou07u5nod9c0vd8mh7aphljq0/lifaxiguzakabuvuguparebu.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/xopusipewejerut.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/gaxafijijabarepemo.pdfIn PDF document text
    • https://braus.uz/images/shared/file/soxerezevut.pdfIn PDF document text
    • http://finchamauto.com/pics/xesijukazusoraxoleda.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/20864277395.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/15033513476.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/tulaxakeluwazasetapupa.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/lawawinemuzumifumu.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109012318328309.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/61485203021.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/34036298812.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/30527538638.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/65769971234.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/78266437286.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/22211023990.pdfIn PDF document text
    • http://cycling-software.com/files/file/21021635819.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/56340407736.pdfIn PDF document text
    • http://ecole.ru/text/images/file/gumoboxo.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/juzalivukig.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210913022411.pdfIn PDF document text
    • http://ailizia.com/userfiles/soziwot.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139845a8ed1d---14420489226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+movie+plus+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_off0000bc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 17192 bytes
SHA-256: 6446993f255f7e026c6c2100261c63e7253e7fc21b70bc733ccefff2a9d79402
font_02_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 10444 bytes
SHA-256: d1a7277cbbf5b003639790dac51246ec09acc7d7c9af8cd510a799777986a995