Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca43c4505b9ecaa…

MALICIOUS

PDF

96.3 KB Created: 2021-09-17 13:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 422c0f2bdcaa35c5de1731e836d0a400 SHA-1: fda93a7bb199abe00fda3ab318bf2182dc229d45 SHA-256: 9ca43c4505b9ecaa0e4e1b3d9755e6679e6613beb93a851d9893c257dd2bfebf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://wastran.ru/uplcv?utm_term=ishq+mein+marjawan+2+online PDF link annotation
    • http://aostavet.it/userfiles/files/vaxagezamar.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/muwefiwitaj.pdfIn PDF document text
    • http://marketingnews.fr/images/file/bisobafufat.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/690333753.pdfIn PDF document text
    • http://clerus.hu/files/file/26216379609.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401d505eff6---26732783060.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/6971905009.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/delarodurirogepudomatuki.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/43467312961.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/nekuxir.pdfIn PDF document text
    • https://cakkue.com/contents/files/77235311255.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/robumefesevolitodo.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/sozenetopav.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137642d8f3f2---50590409281.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210907203238591804.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/54192474275.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/diluxunesemafogobogozipuv.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/24313902249.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/zewekituvakupisekuvatij.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/kedudajuziborozorotap.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/pefoliraxupifetinirufebok.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/22574351989.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/teraxowisonituw.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_off00011288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11288 10708 bytes
SHA-256: a63fc729202b96edbaf39ddca59a69bf025356e416967df7a6597a31a47403fa
font_01_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 18332 bytes
SHA-256: 98189a11f900c1fb309e3d1c99367be30bf1c886c59b0cd84df06f2722aa5c69
font_02_sfnt_off00015b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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