Malicious PDF — malware analysis report

Static analysis result for SHA-256 f395cf6cbebd89f2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 15:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09ec7abf968d48d3c413bcd56821acf0 SHA-1: 973fc1341065816dbe108c0e19f540e9243585e5 SHA-256: f395cf6cbebd89f203885cf3ac2a0c9e32b78a5936239d8744e6c294e96a8544
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5815

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://sacc-la-chaux-de-fonds.ch/fichiers/file/80537366887.pdf In PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/govosupuwomasozarapag.pdfIn PDF document text
    • http://vodova51-53.cz/files/wopaf.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/37730385419.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/34834514817.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/65967824015.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/tovupafezadepa.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161430ae1448ce---20964928726.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/rikod.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/nukinugago.pdfIn PDF document text
    • http://schokofontaenen.de/idata/vaduvewivipalodiwido.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_110104.pdfPDF link annotation
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/geroleva.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161433647b36f9---82795410718.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/gitowekiputulara.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/17695534474.pdfIn PDF document text
    • https://combrooncom.com/contents/files/xobupibo.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210910093638.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/85755500862.pdfIn PDF document text
    • https://stotex.rs/files/jufoxurojinukizo.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210906190126.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/juvejobebavarotakarezada.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/9051340566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fortnite+free+v+bucks+2021PDF link annotation
    • 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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 17940 bytes
SHA-256: 0dd330a6005fd97b3bd4dc642c2f78bed070d46b905be18fb416019dd9518521
font_01_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 10788 bytes
SHA-256: 8f179ba8627ecb106cccd307db27a67baf9d515927f6dabeb1136311fd09cffa

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