Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd1ed91c20761c6…

MALICIOUS

PDF

74.1 KB Created: 2021-10-09 00:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cc4f3004c07f091c69f04ba78f5a8850 SHA-1: 4699488adbc335b90678abc6825a4f3d1ef76abf SHA-256: 6dd1ed91c20761c6b1a2243b1a11193ac44a5e374525bac9241d813c5cdcebff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The presence of embedded JavaScript, though not directly analyzed for malicious intent in this report, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://thuduchouse.vn/pics/file/vixuvakoxolivef.pdf In PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/jimuwizoguwoze.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/rigudutesokiged.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/desikegupogedepisu.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/59065138311.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/nunenibilutenebekeriwova.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/28221989415.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/guwijibobakobiwena.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/xipivotofazavu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/92540e869ffd37bb4b5beb5da4ddd14b/15566246485.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210917200229.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/41567611043.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20211009_C2952D31D0375A0F.pdfIn PDF document text
    • http://ndt-ultratech.com/files/tasuxujabowixe.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/15480783994.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/dudigajagiberexoxowi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614734ff6ea4b---fajosa.pdfIn PDF document text
    • http://5e10.com/file/38423662043.pdfIn PDF document text
    • https://tch.lu/files/files/17661393406.pdfIn PDF document text
    • http://vecsecity.info/editor_up/salusisisopimelomipadata.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/kesofelegivirapomeru.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/70233441209.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/timajozuvafazimazexet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+pe+download+free+full+versionPDF 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_off0000be95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE95 10856 bytes
SHA-256: e3b746888eab8b2a2c478e87cd2737825802e48d7a17fb0285fd8c3acae501f9
font_01_sfnt_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 16780 bytes
SHA-256: bba900d1b4b61eaf37716c3f6f378495ba1600dcdd7a516a2172068dcf58f97f
font_02_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1