Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbe570e9286857c…

MALICIOUS

PDF

95.5 KB Created: 2021-09-13 14:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5cac3b5c9846a479b417a3100c495fc SHA-1: bffbcc00ef0d57b59923aacc2bbdc3e7cc881bcc SHA-256: 0fbe570e9286857c154e4cf33f9740ff9067cc4d19d310393cd61e7492ece635
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware delivery. The presence of numerous external URIs and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect the user to malicious sites, potentially for further exploitation or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://philabc.ru/uplcv?utm_term=latest+android+version PDF link annotation
    • http://dui-antidote.net/images/userfiles/file/moguxisizurokudijemazux.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/56103747046.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/88748493005.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/12576825338.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/bosumudexenomesejoweto.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/rasunopadalemobujisexuvod.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/94727383860.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/52069824094.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/68888772918.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/wovawarudupovojifefofu.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/filikomati.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/12969420048.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/62429955648.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/mifibironapituj.pdfIn PDF document text
    • http://acelybio.com/upload/files/zesalejuxariz.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16312322629202.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/zaludepezevudipulewap.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/40544604530.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/44803963093.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/28af53511d90ba956c9632d20f9905e0/7573033451.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/94220739192.pdfIn PDF document text
    • https://senegal4d.com/contents/files/sobetunet.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/99520933338.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219918204374.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_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 17928 bytes
SHA-256: b241bb5a97b837fa350176fd1f92ca1449232ffe0925b5df2e9eab344055d981
font_02_sfnt_off000159ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CE 10216 bytes
SHA-256: 4ce0adb5a1051f3cb57b04203d7f35811131fd9b430bf95b8e3a704cd0b43748