Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d862a55caecf87…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 00:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfd61b9255829c41fa152b408928c9c7 SHA-1: 8340e0390f10fd7421f011662dca8412f0e0dada SHA-256: 47d862a55caecf87521b7cdc828e87aeaa7861716cc1b19889f232aa65f20ef6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the document is designed as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://undergroundtakeout.com/userfiles/file/xuxesidudukaf.pdf In PDF document text
    • http://bettynblue.com/upload/fck_img/20210912/file/bomelevarujura.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/gepexexajodi.pdfIn PDF document text
    • https://andana.us/files/files/96403435476.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/mudotunowel.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/81136234645.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/29531064764.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/dekujusikutumurisizujerid.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/40421367129.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090106545373499.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-25/20210925072939365929.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/20562247928.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/37954273991.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/boligaredijovojukemovid.pdfIn PDF document text
    • https://olterus.org/contents/files/4396254330.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/20523759423.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/71567714413.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/neneguxitulu.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/15506270738.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/27988417126.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/85175998191.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/dujitawafuxarubexen.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/37249965201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+change+low+battery+warning+on+androidPDF 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_off0000aea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B6 16148 bytes
SHA-256: 3511aa150c0701153059c312301dc6f62acab78de5f946f95102ff7b51e0e680
font_02_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 10812 bytes
SHA-256: 927034e3d4e294e9cdb628c52e0c6e2daebec873753939503bbece770fe9f599

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