Malicious PDF — malware analysis report

Static analysis result for SHA-256 163e59f3cb8b0986…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 18:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 148cc9f08d304b937f04d867acbd0e2b SHA-1: be5ce79ed666f89f0be60ce21e28bd43806939d9 SHA-256: 163e59f3cb8b0986471b5554054e1cbc21f484b70be1e0c284cf1dc27f932ca0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=descargar+screenshot+para+android PDF link annotation
    • http://lateonsettay-sachs.org/userfiles/file/66183816566.pdfIn PDF document text
    • https://defi128.com/userfiles/files/pudidewo.pdfIn PDF document text
    • https://teamcode.net/upload/files/jurilunakebuperebop.pdfIn PDF document text
    • http://aa-nusd.jp/47608571071.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/89585699448.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/wamera.pdfIn PDF document text
    • https://estoniapools.com/contents/files/loxamulu.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/59890686316.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/sexazigomusamu.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/sefezaxewerotilutaxex.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1d6a7d5fa4153896c4e549cb15778be4/jepabogenuxudipivo.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/zozasujuv.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/54882033122.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/vaxebijasuxina.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/60112668677.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/tatexuxesalesog.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/6536865580.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/vofefinidadevibikuguzem.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/18112823482.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/53981178728.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/vegoravurubejove.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21eda8f1d---vawimob.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/11358783664.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_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 17840 bytes
SHA-256: 899969967e8a670b61b3eb9f5eaf5912ab0eb09f9fbc39561eeae02b97ad7bd0
font_01_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 10748 bytes
SHA-256: f8422d4b7b69ebb50be40812666e418cdbbca489ba8a43ef58a4351f34716b1f

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