Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9afd36fa6edca2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-22 22:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f414a71e9dfef6b6729d3277922cb0e SHA-1: cdb62a2362a088c6d8759e88b8e715465f542f2f SHA-256: af9afd36fa6edca2a58f6e7807eef4c3638c1b15c0d4f536e34ed74c67bde167
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URLs pointing to disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://wastran.ru/uplcv?utm_term=dua+before+food PDF link annotation
    • http://csc0898.com/userfiles/file/20210910195512_yhnpy4.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/wukonefuregososiralunafur.pdfIn PDF document text
    • http://air-ned.com/uploads/files/xupewamuzafinejikada.pdfIn PDF document text
    • https://parc-hotel.info/file/99122981389.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/wigovuwozavonukurub.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/86298135796.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1614209d2c3b34---39492111376.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/54328581601.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/92537690870.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/naxuwipumokuvilewo.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/76475580822.pdfIn PDF document text
    • http://askort.pl/Upload/file/55864549884.pdfIn PDF document text
    • https://tomaszbizon.pl/web/uploads/files/96200517108.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/kifavewaziguwamopumi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/32885676484.pdfIn PDF document text
    • http://full814.com/upload/files/21625241367.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/27568028816.pdfIn PDF document text
    • http://skupka54.ru/upload/m/5791776175.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/vurida.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/20760944273.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/23191814420.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/76043387329.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_off0000c03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 21112 bytes
SHA-256: 6982c5a889539c138eb35592a4506b741451b0660bdc5a4e610c361b904e6ff7
font_02_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 10080 bytes
SHA-256: f195cd68e5e753db36dd157775158244e20fd1dc55372eec74f500d42692cc0e

Open this report in the interactive analyzer, or submit your own file for analysis.