Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdcee3c783afbe2…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 13:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 474361f15881d8ef0920ddbcbe4c987a SHA-1: 936dc4b41dc344cf2ee5ad4592283f697bd59b2b SHA-256: 8bdcee3c783afbe2f3ccf715d6f3cc22558bb5e689653841650bd872753f524a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot used to hide clickable elements. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://daming-school.com/userfiles/file/53513469306.pdf In PDF document text
    • http://dulichtantai.com/files/uploaded/files/fenodojuwulugoniwital.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210916200936-zigimugajalide.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/11168286291.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/79207453601.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vmg66bv16v7j5uq3bu286itd42/dapoxupobaxiserazisidute.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/94090689339.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/tavumunafixivenubunosiled.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/6487297674.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xeperavusagewunalojako.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/30545671927.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/defifomuxufamarim.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/14983299856.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/javowosofudakodoxatasigow.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/sosabilomidasa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378a043bd68---18906357124.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/bedonalolujuj.pdfIn PDF document text
    • http://nktrading.qa/file/files/nujobijazepaxitono.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/61133192310.pdfIn PDF document text
    • http://k1a.ru/images/files/file/forar.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/75861295604.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/84604502036.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/39849910984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=my+phone+is+saying+no+network+connectionPDF 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_off0000ae11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE11 10892 bytes
SHA-256: 90e170655d305ad47041bf005065905122cab7d359954780b164488bb46150c8
font_01_sfnt_off0000c75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75E 14300 bytes
SHA-256: 3ac2f417a311a41f730836dc80e1ddc71d096da5d2c723769b64c88b4fc092f6
font_02_sfnt_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1