Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced2d879e9543bf9…

MALICIOUS

PDF

75.2 KB Created: 2021-09-23 12:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e5ca153612ccc49b182dbe7a452cb3fc SHA-1: 8b871a9c37817f6b19da4447053604e195ce46a4 SHA-256: ced2d879e9543bf9f6296ad19746de9a0c8ab2190256859599da6f1ec8827605
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a distribution or phishing campaign. The presence of 'utm_term=minecraft+mod+apk+app' in one URL indicates a potential lure for users seeking specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=minecraft+mod+apk+app PDF link annotation
    • http://adacu.org/userfiles/file/20210911052359.pdfIn PDF document text
    • http://logicamail.it/draft/media/mebupaponuvufuxuwixipuvup.pdfIn PDF document text
    • http://reopen911.info/media/file/85144212177.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/6515978117.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/metofobagotitov.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e45de3c0aceca42d810c25ced7af30ea/34631595760.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/56886359477.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/zevovowowisilusewevat.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219141446127485.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/77973970908.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/84270013258.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/62828480875.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/patatikut.pdfIn PDF document text
    • http://allier-genealogie.org/File:/fubikameganofaselal.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/43265391498.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/92643341020.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c823f024---83984851797.pdfIn PDF document text
    • http://pk.mo/userfiles/file/fujumomuwegezolo.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/51377508501.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/71212363803.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/82452189668.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/watefoxudef.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/84871692723.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/defujizozasojikubux.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/givupepetawo.pdfIn PDF document text
    • http://air-ned.com/uploads/files/safezekotutozumapos.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_off0000c2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C1 16952 bytes
SHA-256: 9a4bc73358c4f5620ea74130cb90ef1e40a53c0a5554d203cf4d51a35d7bc1ff
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 10652 bytes
SHA-256: 71527910e8b2a68031e4bf7864b0f28fac4fb33919ca0b128b61b5358715144e

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