Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f33a0c252c4a27…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 19:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb87485c7722196c8981c9d26442c4ea SHA-1: 277b93e21954c02b750fcdac1d2e7b3faec93204 SHA-256: 20f33a0c252c4a27d48a7c6d7b39c1bb746cd04d6543881a28b788b65dcc2835
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, presenting a download button lure and embedding numerous external URLs, many of which are likely part of a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://adikketiga.com/contents/files/91693873649.pdf In PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/sopuju.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/29751847466.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/43366372655.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/kamolepebosimobi.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/18330515958.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazijumipi.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/tajuxekafeladaleparovat.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/7533921353.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/dubelorajakef.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/mizapepileradivofaxamipi.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/ronorisigo.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/31586624446.pdfIn PDF document text
    • https://atiksigorta.com/files/49031663569.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/48075350557.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/63679431297.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/napasupagom.pdfIn PDF document text
    • http://chemicalengineers.ie/images/5014542511.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/39143841591.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/20312293809.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/defajanuja.pdfIn PDF document text
    • https://people11people.gr/uploads/File/vonidaxofiguwejabodi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3dd4dd815---40387327826.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/30462375185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=chrome+android+default+desktop+modePDF 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_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 18364 bytes
SHA-256: ec88fb077cbd01bf5b0bca402fe1ce8873c792265abef473c003c6c66b022631
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 10984 bytes
SHA-256: 0fb608564fdb776d92d6dee71329e7d641168948c8d32b96f3db012a004ea364
font_02_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1