Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d79b8286d7757c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 12:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c9eef5577588f61b77fbd604c8c7170 SHA-1: 3435282e7d43b1a352da9fbd66c73ecb835754f0 SHA-256: 35d79b8286d7757c472f44992b78bdde566e4f2a07ee37e51b31f0997d3a2abd
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, including one flagged as a random URL on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick the user into downloading a secondary payload. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=download+ptv+sports+for+pc PDF link annotation
    • https://spa-salon.ru/ckfinder/userfiles/files/54190268719.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/wojomilomebejawikomo.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/jedumisakoxexisavofa.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/sofeve.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/sikulozos.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/39019065691.pdfIn PDF document text
    • http://videocycling.info/files/file/51920950099.pdfIn PDF document text
    • http://fruitsad.pl/images/file/depekovekebipi.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/fobigerasuvejokunawodi.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e9629fd7340062464a1c60c5e04900d1/wuxasatuzirujavinop.pdfIn PDF document text
    • http://dd-eng.com/files/files/59247552151.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65568bac6---77122503921.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/vagexopupivi.pdfIn PDF document text
    • https://geloracinta.com/contents/files/67982463474.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/pefodose.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///94874837663.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/38757908453.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/doxipikoleresezevedupe.pdfIn PDF document text
    • http://haai.org/upload/file/vabefuwesofojuno.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/93533170968.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/gizobekudezivu.pdfIn PDF document text
    • http://teifsepahan.com/files/file/77008961729.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/42208933492.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905105128.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_off0000cedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 10544 bytes
SHA-256: 9d0ae145ff34f03b27c6872768317f1ae5244bcab459453fea536e2c73cae269
font_02_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 18292 bytes
SHA-256: 5df5e6d40c0ee8a89ba46199f6b4376160bb980f6a9b481f88171ba066602049

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