Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f1b53701cb0ea9…

MALICIOUS

PDF

139.5 KB Created: 2021-09-19 22:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10d6f47776c734afe959a544e27e0d19 SHA-1: 1c52ef21b0a2a42dd865f6cdce4fc48d87a814cc SHA-256: 99f1b53701cb0ea9b97178ab51e87dc8a01a593f7800f1bedab9a4b6269ec463
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://smidgel.ru/uplcv?utm_term=farsi+fonts+for+android PDF link annotation
    • https://kurek-rowery.pl/user_pict/file/596588873.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/36592035587.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/nobevaluxexage.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/52993339325.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/94406691502.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/sekavovatixazumefefow.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/fixepepozumojejugonilap.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/semakunuzudus.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4be165d9---29982255416.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/barosazexedape.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/96102410160.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/53304155184.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/wasalobawilalafitevuxofi.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/6827950186.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/29608239610.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631330464.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/zabamowisodugas.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/36231650158.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/23608397101.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/56293682106.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3842afcee---32804364149.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/82682581310.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/sowesararebudokelivogu.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/96424603088.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/tigodonijajorutereluxod.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_off0001b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B46C 22944 bytes
SHA-256: c9131c7edbb1c562383794f4e69842290d5183bef633647176d05a53abf56d20
font_01_sfnt_off0001f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000208bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208BF 10148 bytes
SHA-256: 185f2e992c88e47175774d24f8a2b7f9abb0ee0add8a142b5287ea7e3bebd537