Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0b11e97e29fff4…

MALICIOUS

PDF

82.1 KB Created: 2021-10-10 07:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d6c11fbac5348bdce4fa6383ec76d770 SHA-1: 9a194c81e55b62b83d6a566a54f279690fe4b9be SHA-256: 5a0b11e97e29fff4720129ffdfbc56fc2d9ba8896fc05db165fac2f74b6ef6f0
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

The PDF contains embedded JavaScript and multiple external URLs, indicating it is designed to lead the user to malicious content or download further payloads. Heuristics indicate social engineering tactics, specifically instructing the user to execute commands via Win+R or a terminal, consistent with ClickFix attacks. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tizianaiberti.it/userfiles/files/xobumulipupokuvesota.pdf In PDF document text
    • http://amadpich.com/userfiles/file/gilov.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/3536477746.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/narozerutobafixikusopuwag.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/869235513.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/wufefu.pdfIn PDF document text
    • https://stormester.no/files/file/vavosukajerovabutezaw.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/35556579524.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161535b38ceb42---forokuxogeja.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/puzolemakozebinolul.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/logexonudebuliroto.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/lozogogurilumideweji.pdfIn PDF document text
    • https://ayurmitra.com/files/file/zarupomijasawo.pdfIn PDF document text
    • http://artcvajk.friendship-match.com/upload/files/29544439015.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/tokepikolipodixokosikero.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/zatalegegoxa.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/6378587058.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/56817783384.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/88988520331.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/66981894105.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/midedebiluvozikukoduz.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f116e4745---polivazifotakowejuwe.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/nedameb.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/limeturimeborupuripud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=command+prompt+codes+for+windows+10PDF 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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 11024 bytes
SHA-256: 9f4d3f4154dc0f9f1ca54b963c97cf86aaccc788afc2095eb076b184f85e7a50
font_01_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 19324 bytes
SHA-256: cf55c684221ed9ecc2dcb388a315ab142a29bffecf7ba58f05339fdb3f79dcbc

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