Malicious PDF — malware analysis report

Static analysis result for SHA-256 453856d5867e6509…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 00:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c77477e61372e25f6d69290f9fde213d SHA-1: dbfa3c670c361d31f573cc592e4ad8c4cadb1a09 SHA-256: 453856d5867e65095c85467ad39b540ad8c874811eb40c3ad2b4d97330fe8140
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sevvalturizm.com/rsm/files/85188040991.pdf In PDF document text
    • http://rayanchem.com/d/files/fiwuxun.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137596b3671a---vamewusubozigilejafoteg.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/470dd7091bf4324d0e7b386d3f266437/77729637871.pdfIn PDF document text
    • https://frisch.ro/files/file/joneridi.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/ruwimafasijumefimuto.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///pakinukak.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/vuvatafimivebuwelagovawi.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/zumabegusawodusejatato.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/27343953364.pdfIn PDF document text
    • https://mkontroll.hu/File/tekusipetixekanubekejajoz.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/bonoxenijugipopekikevi.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/zagenumazenapelukoruru.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/11300075868.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/24946803897.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/rinijawegazipaxolusataxu.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/16535346225.pdfIn PDF document text
    • http://licausi.it/userfiles/files/92624338316.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/75367429607.pdfIn PDF document text
    • http://gdgom.com/upload/file/210907184622755388h67c23zl6kev.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/kagujidubapubunibel.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/wapipegifuw.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/80366628428.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/vufusedejef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cheat+skin+mlbbPDF 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_off0000ca00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 10416 bytes
SHA-256: 27afcbc4443bd4fa669482eb0a9a48d960dc43bd4f6eadad11e302845c1e8755
font_01_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 17300 bytes
SHA-256: b1e917c36acbe6e859da0d3e1f8d3e99e6009f858b069d6bfa121cdf9160d780
font_02_sfnt_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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