Malicious PDF — malware analysis report

Static analysis result for SHA-256 573660c95ca2ad4a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-19 01:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e2d7bf50cf343a7fe7c6a9151ed85c5 SHA-1: be83088feeea7cfbaaaee39e85024638c32e1e51 SHA-256: 573660c95ca2ad4a5c7ff0149d4a3669ca4a188956536415206056c7aaa48fb2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is commonly used in malicious PDFs to execute actions like redirecting the user to malicious websites. The PDF also contains a large number of external URIs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://clubsecurite.fr/webroot/upload/files/sorunibanovilukegufukufar.pdf In PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/bewupijuwasibixutelusatu.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/mekumizokizuvugitipu.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/kenupili.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/54464739017.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/22515518524.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/80671381593.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/mojifakawatebisurekuse.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/17780821458.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/xokidifediwititepona.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/64229303350.pdfIn PDF document text
    • http://hejia-ele.net/upload/47078629740.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/wepusawu.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/79546406169.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/xizogatu.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/mimidenida.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/padudipalaf.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/fukigakilonegixovalep.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/46ik9tvem3ilksutart9k9vrpe/89751509972.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/38888475380.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/nalazilibadi.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/toweve.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/71866263224.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/63139524900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=moto+3xm+onlinePDF 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_off0000b1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 16516 bytes
SHA-256: c348af9b2d134bc612b55d6021c83c53f69baf9d04fe3270cbee2f0f8cfb45c1
font_02_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 10108 bytes
SHA-256: 8142c79d5895d20b9fc95d1dd0e15e1fd9dec0a36d1a7521c91708ab0af95f7a

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