Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b073348533190d…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 20:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5496abe7a4af47a783fb06ed20517af0 SHA-1: 630c9786831624929247264f936382ab1d7b474a SHA-256: 53b073348533190d0361e602dbc66c3ac86366588567228038851fbd726aada4
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. Several heuristics indicate the PDF is part of a link farm, pointing to numerous other PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hantverksakuten.se/ckfinder/userfiles/files/tujixesi.pdf In PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/dilotewosuxopevisen.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/durub.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/refijudilasuvumiduratu.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/75622570922.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/33925556928.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/60264759958.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/41dsip10mmbljrp83rusjpheis/12169766054.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/99729802329.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/35659682253.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/16217313307.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/6795883438.pdfIn PDF document text
    • http://decorstore.eu/upload/file/14235389780.pdfIn PDF document text
    • http://linza-market.ru/upload/files/xuzoko.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/ronerexebiginepijuzov.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614423edcaf9a---vogosin.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/18326599878.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109060315314373.pdfIn PDF document text
    • https://riwg.in/userfiles/file/guxazananakarolag.pdfIn PDF document text
    • http://medrea.ru/upload/files/wamuki.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/robixabavetulorisedote.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/51001870978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=recorder+of+deeds+st+louis+countyPDF 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_off0000b078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB078 10568 bytes
SHA-256: c667c304a55e79d212c2de1c408af4b92c1c04c6947305c11e00a20193d9a46a
font_01_sfnt_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 15020 bytes
SHA-256: 58cc74d95695320693fea4e407f9abed0fd77619668c2d75c162f56909ec34db

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