Malicious PDF — malware analysis report

Static analysis result for SHA-256 72974504c5a575ee…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 03:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e10831a744be92c7cac039861d5a05ec SHA-1: edc34d402060b27153a6d8d6857652633fe1eab2 SHA-256: 72974504c5a575eedecb2abfca238e9e8b989c21fe70b2cd5027e030483907f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious intent. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

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://catamma.ru/uplcv?utm_term=x+men+arcade+android+apk PDF link annotation
    • http://cuanhuadanang.vn/uploads/image/files/xokofamusaselotogiv.pdfIn PDF document text
    • https://dernek.daynexdemo.tk/upload/ckfinder/files/dotijakasawekopi.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/11200978155.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090200593588.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/puparegolizigogagidozinid.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210915_222001.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/bojalejute.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/21/file/20210921_035521_122.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///83429490227.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/narafavirinar.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/bekoxa.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/24120808868.pdfIn PDF document text
    • http://qdjshg.com/files/file/70392434471.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/97604648042.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/25015718234.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/74557021116.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/tejitididazalozutobulo.pdfIn PDF document text
    • http://www.agot.pl/upload/file/63496923190.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/diwizofugavudidewutumubi.pdfIn PDF document text
    • http://headrepublic.pl/images/files/niziwedinuganogijog.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/55533133522.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613497b3a8e3a---jazukoratisolaki.pdfIn PDF document text
    • https://granitnet.hu/editor_up/41804284237.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_off0000c7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 10464 bytes
SHA-256: 1236d587e2307afc33f452765c09d55273f2b0689d166795735688863b125769
font_01_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 17044 bytes
SHA-256: 7377268a35ac41726cd59362e01ab0f6e77d15998bc9f21ea227f79dd012814f
font_02_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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