Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e1dba4d45477ad…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 18:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e0107599f7049bcafe39152494c4965 SHA-1: c849e4382888437c92a003810f13974ece618d65 SHA-256: 53e1dba4d45477add32a8057a1307a33b39b5eb2c16a5df6496fd50ebf6c5316
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to external sites, likely for phishing or further malware distribution. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=can+we+make+android+app+using+javascript PDF link annotation
    • http://cinebuzz.be/uploads/userfiles/files/kubizu.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/legatidetufaj.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/fegenikel.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/88479189271.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210907024703765133.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/83677977603.pdfIn PDF document text
    • https://comfort8889.com/upload/files/bafapogevuvagamipeliv.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/fotiwutafupekororuj.pdfIn PDF document text
    • https://scalping.ir/data/files/file/sonazonapomazixetemare.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/77654026006.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/dulipofawutatoferolubopud.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/59a532dc3841b3fe44d90e02a2c66668/pipibupot.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/83059749463.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/27105888804.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0908/39e6cf5f7b6a6f4e91b0f64776398f00.pdfIn PDF document text
    • https://makenie.com/upload/files/pifajetokinopozop.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81957d746---banogudaxewowigusowovisi.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/neputigorazur.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/kotizapesuzovosaxe.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/sirupaj.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/ridekasilubawi.pdfIn PDF document text
    • http://orem.mn/uploads/files/49703523785.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/zabimave.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_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 11316 bytes
SHA-256: 7b8d41a658de6745380ae379501e8983043a296f48b18853009b0c7ef6b52830
font_02_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 18208 bytes
SHA-256: 3cd72030479f3a9060547890ed80094827dd8c4d93f87e8b0fe678cf2d294eac

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