Malicious PDF — malware analysis report

Static analysis result for SHA-256 a340163054d717dc…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 08:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4468ef13aeaf61d9adc217f9b40f7b2 SHA-1: 013c09b1c227af9bdd71361191549d63f6247eec SHA-256: a340163054d717dceabb4451a716586bbfadc9f22268f8588e7bc27f29b174a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to redirect users to malicious content or phishing sites. The presence of multiple distinct hosts and the 'utm_term_redirector=True' heuristic suggest a coordinated effort to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://888nv.ru/userfiles/file/57229639064.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/96544590208.pdf
    • http://morpheus-architects.com/file_media/file_image/file/pubizokapirorazol.pdf
    • http://bannails.com/fckeditor_userfiles/file/50698857454.pdf
    • http://northmarking.com/userfiles/files/nujufizut.pdf
    • https://capitalsyndic.com/userfiles/file/jewodarofutov.pdf
    • http://ztracenaexistence.cz/files/content/file/diligorokagaworuvokujob.pdf
    • http://tottazo.com/userfiles/file/dagexaxu.pdf
    • https://liantoong.com/archive/upload/files/26007957001.pdf
    • http://dulichtantai.com/files/uploaded/files/2008288402.pdf
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/86379902615.pdf
    • https://dongciao.com/uploads/files/202109131604198434.pdf
    • https://bisnismedsos.com/userfiles/file/33671915019.pdf
    • http://kmkonsult.cz/userfiles/file/8953627767.pdf
    • http://ghibms.com/userfiles/files/46655000351.pdf
    • https://terracell.pt/images/file/47863771345.pdf
    • http://premiumcsp.com/uploads/files/13007901133.pdf
    • http://mikailang.net/userfiles/file/20210910044728_396016397.pdf
    • https://internationalmedia.com/userfiles/file/titusi.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8ba0b72078a64dcf8095626dd6fa206c/15001045392.pdf
    • https://homecareangels.ca/files/files/files/zaragumifef.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/20788576695.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5oti7064lvvt8sievsdsou2ifj/jodulosopizofidejopew.pdf
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/bupodulijelov.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/muwevomam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=zapya+low+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baec.bin
605751b345d95b9bf66276884dda44a04872a87bee507019070bd27324a111ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEC 17300 bytes
font_01_sfnt_off0000e7db.bin
1281730df3f7340ab9e10ca016edf11d0a1d1d5da82c5672ba0296890819c501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 10376 bytes
font_02_sfnt_off0000ff85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 16792 bytes

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