Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fe4e6e668b63eb…

MALICIOUS

PDF

86.0 KB Created: 2021-09-14 04:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57bf3aadd86fbe31565ec9786ad9bda5 SHA-1: 244e8f8f118aaa53f231b2baab755626ab9a51a6 SHA-256: d9fe4e6e668b63eb94f8a7f0c513285c4f616fb102916fe42bef0b2136fb2c5e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=angry+birds+go+download+mod+apk PDF link annotation
    • https://wic-net.com/userfiles/file/4189261691.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/66867427660.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/vosaluwisufagafo.pdfIn PDF document text
    • http://someteme.com/archivos/_20210903031906.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/valaxolufekemogitilufo.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/tijebomazatinoku.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/13156688783.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/21568479958.pdfIn PDF document text
    • https://mkontroll.hu/File/36892453197.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210914_8B4E43B7FF500770.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/6934882609.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/ritadevumemutodexanupabok.pdfIn PDF document text
    • http://laserinnsbruck.com/static/26286373575.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/2235477597.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/51689626016.pdfIn PDF document text
    • http://beiks.info/public/file/53344040953.pdfIn PDF document text
    • https://scalper.ir/data/files/file/65502266178.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/nolavisujetul.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/nupalizenuto.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/18535028746.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/23237172419.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/zubuk.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/bulufuxebavusisewigi.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/rokebowurarumamev.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/xasikumivoxevuwameruzowop.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25790348106.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10fac989e---zaxenavogatexudowaguw.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130227c8dbb4---durufem.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_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 17912 bytes
SHA-256: da593e3cc0047de32626a4a1b06a07847a4401149c704dc86c6bb4711bc4e998
font_01_sfnt_off00011964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 10920 bytes
SHA-256: 2b4862cde97b425bcc675b3256f8f351e77731c4819e5cbf770f96ed562a95c9
font_02_sfnt_off00013243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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