Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9aa492934ae611…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 08:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a967c182bc382084ce00f212c30517f1 SHA-1: ff2467f7a534bb2b196b21de53cba260d66face0 SHA-256: 9e9aa492934ae6117b88669434ceb80286776b318f5423cf9cea4e0bf730591c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=what+is+my+voicemail+number+android PDF link annotation
    • http://sportingclubalbinia.eu/userfiles/files/pigozit.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/vilifuvibevovo.pdfIn PDF document text
    • https://people11people.com/uploads/File/71362549809.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/wurejowezefinakimozilawuz.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/zularodoseduzovazira.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/71018181994.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/55792683531.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/xaparituzobekuvorilodu.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210912021158.pdfIn PDF document text
    • http://groupkaishan.com/d/files/42105745670.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/87419583030.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/rulifipokego.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/gulivofolibifogobamisud.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/11157462331.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/nepex.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb440a754---48390248274.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/94935440465.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/tesofaxanikaladix.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/mudorase.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/9661411079.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/1418162445.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/24781419233.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/84430675534.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614508f801f69---pizunowofominud.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/lelojetibusigukepovusise.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/vewisimironol.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_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 11048 bytes
SHA-256: 0c84c313b75b958283073ef7db34bf7bed23c8a6e08c86b1691ee901306cab90
font_01_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 17976 bytes
SHA-256: e141876be338d04fcee8f212785735ae310219a5693559f82e5d4464dd6e6db0
font_02_sfnt_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1