Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3db3ada757dc22…

MALICIOUS

PDF

70.9 KB Created: 2021-10-01 10:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6e8dbb24d81c258e462bbcb3f324782e SHA-1: 8e05ca0266bf419df8c81cf67462bba88eb586b1 SHA-256: 2a3db3ada757dc2256d74770677a6c188dfed9463f363fc6a8f9bea32d2f7c1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While the document body is heavily obfuscated and unreadable, the presence of many external links suggests an attempt to redirect users to malicious 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 http://rs-entp.com/upload/file/54160888422.pdf In PDF document text
    • https://aimhc.com/userfiles/file/25910558163.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/bumilevol.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/48137045009.pdfIn PDF document text
    • https://apapunada.com/contents/files/nizim.pdfIn PDF document text
    • http://glassick.com/userfiles/file/47431642285.pdfIn PDF document text
    • http://esistore.com/userfiles/file/xizorafex.pdfIn PDF document text
    • http://indemo.pl/Image/files/83589019181.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/fakawezupejegiwufeso.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/34334375735.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/pumunakibekaxusoja.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/tumono.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/63324924939.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ac58bc11296f81004472bba8612df985/37052628902.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/guxabiwijalo.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/54703206591.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/70291773373.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/lobasugetekuwukax.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/67453761324.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/8889090180.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/66281246667.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109150552006403.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/sibaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=truecaller+2021+apk+downloadPDF 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_off0000af82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 10684 bytes
SHA-256: 6ed0c340b215e1445dd15d9375e846d32d7d7f487575203c61feaa29b9525c16
font_02_sfnt_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 17776 bytes
SHA-256: cb87f1184c96556d331b7e787e4f6b45df282e63b4493b8b879b34f241de0d4e

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