Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2f6883d7a4b35e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 03:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 405568bbdb10409f958605b4a925d44f SHA-1: 77b7c58524802e9f106ef1723d25202bbf7cf04a SHA-256: 0c2f6883d7a4b35ef1c58dacdfaa5d8dd68338807e2651ff4e10673baa59bbd7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV with a critical heuristic firing. It contains embedded JavaScript and a large number of external URIs, many of which are on distinct hosts, indicating a link farm designed to redirect users. The presence of JavaScript suggests an attempt to execute code within the PDF, likely to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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.
  • 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
  • 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://kiddeefire.com/media/userfiles/files/dirin.pdf In PDF document text
    • https://anaksemut.com/contents/files/gilipaxuxolanepad.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/sasixufelafenewil.pdfIn PDF document text
    • http://marljivo.hr/UserFiles/files/14021183407.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/60024774513.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/33406086135.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/gozun.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16304719771352363654.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/pupedilejalabopelemefo.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/kulogirezap.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/remufufemilijokowiwax.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/mawumezasubavegerum.pdfIn PDF document text
    • https://ivanamihic.com/files/vimulolomu.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/19947558316.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/pizixojefogubegok.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/88351516854.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/wuvivadakonufugenewuni.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pikusabojuzi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/09ef7158b8789d3801c2395160eee3ad/jujujusoramumavaxa.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/firoxupiwur.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04b3e3102---misimomixelifatux.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/vuledifisufawovulu.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/gevowojomijilixaromide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=play+store+new+update+apk+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 16924 bytes
SHA-256: 0e9a9deabeae021685fed7e65edde3c2f01b00d79ecd215d87182c0cb2a61ee0
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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