Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a3ccb67eed5650…

MALICIOUS

PDF

77.1 KB Created: 2021-09-10 14:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6a444e4d3a07bb0b62b47ff5eec47dc SHA-1: 84fa18408bc5bae52bdc626056f92bb8173ee700 SHA-256: f6a3ccb67eed5650c4cb6cbd1c334c5ec370c94b42c622d10a716ec92abf8d29
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF redirects to a large number of other PDFs hosted on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ww150002.linebot.net/upfile/files/20210910121146.pdf In PDF document text
    • http://oilspecchem.com/files/ladivalujepijiri.pdfIn PDF document text
    • http://vodnik48.ru/content/file/56459414273.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/wegesuledofajiruxovemaku.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109081212332698.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/17923878590.pdfIn PDF document text
    • http://winso.tw/userfiles/file/tilopisowafadokakerab.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/79397122184.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/segelijepapusaj.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/38145092654.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/93640698793.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/fatemowazivanubap.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161391c2cd0697---ganolabirozomigeteri.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/dukixuzigimavikaralew.pdfIn PDF document text
    • http://zamgph.com/uploads/file/021407255011.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202195_6546_971.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/bakelaguxu.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/17047772171.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132041ac5e2d---juxigasiv.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/39678857234.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/26311251348.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/sikudej.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/11295132855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=so+files+androidPDF 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_off0000ca7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 17304 bytes
SHA-256: cbf59819d269fe988b607f94886667f13db5e331c775782f548a85caa8b560c2
font_01_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 10324 bytes
SHA-256: 909d3b5717438e10adc9c6352c5aecca9467459c20323bb4feb14d59c18f1cf1
font_02_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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