Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6c5270711342b2…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 22:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0384fd4623c01e319fe073940c7b2f9a SHA-1: 25fae85a4458a14e56c53bf3e8cb38751b3584fc SHA-256: 9e6c5270711342b2e6327a078d4e5685259c3f7972467846f3e3832cc942133a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded content indicate it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=how+to+draw+parabola+graph PDF link annotation
    • http://www.sandipmallick.com/fckimages/file/bodomerutetametixe.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/55368506785.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/39944117372.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/sakelajawikoj.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/95550393020.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/buvotusilow.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/rimeka.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346d4ac1bab---tixukuguminaxudipefepuf.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/bosubaxomujejepu.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/fuvefutakir.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/feribifosetureze.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/lifurag.pdfIn PDF document text
    • https://kenadong.com/contents/files/37055055451.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/85788887457.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141df86e4d27---3411413237.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/72136127117.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091011102_367080043.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/44179042584.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/jotadivukinavixopufaxono.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/37234077353.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/26180393110.pdfIn PDF document text
    • http://smirna.pl/files/file/mubodijofinexu.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/befaxoratudener.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_off0000b95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95A 10392 bytes
SHA-256: 68092a0d3df4d9527243b5bb05380f9c79e1bf8bc606359022b64663105c73a4
font_01_sfnt_off0000d081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 16600 bytes
SHA-256: 519d05384e57022b34ac025b6c16b45fd09422ad083fcac00378f15009dfcb20
font_02_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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