Malicious PDF — malware analysis report

Static analysis result for SHA-256 a311a59c0457a25b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 07:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4283f45bad51001c3b6492ad04a48e0f SHA-1: c5e3b084b6f811f0d707a1edfabd5106cdde4da2 SHA-256: a311a59c0457a25b94ee465c1222396882debbb0c5e6b0e3e8e8b533512ed210
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings and the ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing or malware delivery schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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
  • 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://sevenhillsgroup.net/ckfinder/userfiles/files/kurufuki.pdf In PDF document text
    • http://hanasushipickup.com/uploads/files/68140935748.pdfIn PDF document text
    • https://svltv.in/userfiles/files/41751611469.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/fixufufur.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109022156169935.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/93824197695.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2lnh3gmin33c19o34drbukc2i4/kujejawexofana.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/nanovikobetore.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/xerokosupuwukodakusokaz.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210918004627.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/78287796692.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/52225094231.pdfIn PDF document text
    • https://scalper.ir/data/files/file/lisujadek.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/57553022678.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/4773582335.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/70076886340.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/gexosebopowujod.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/82032771905.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/77730405643.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/28668539473.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/67068661526.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/kilata.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///70671240543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mayweather+logan+paul+stream+freePDF 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_off0000ae25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63C 11004 bytes
SHA-256: 7ff5e90a1b946b41b56cdf526df0fbd169e60ce23b5a60148fec34ffb1165195
font_02_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 15092 bytes
SHA-256: afd0f03847c2dc734a89fb37a308c276b4cff67acf297c07d9f26c344dec1b5e

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