Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb77a735f6883602…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 13:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7288b62d186aeb22341d35482bec12af SHA-1: 465ecac7f4231d4ca6da670c90f09dcc56b01ae4 SHA-256: eb77a735f688360226ddc64d2a747ab91fac38d2086945489e2289a2f82ab9cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting a phishing or malware distribution scheme. The presence of external URIs and the ML classification strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://archism.ru/uplcv?utm_term=dual+space+lite+mod+apk PDF link annotation
    • http://msiutilities.biz/documents/xutizarubozutikob.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/70707432524.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/nokosidirenenilufupi.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/47176184495.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/bodatimudalomezisamod.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/25711393412.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/74845758610.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/614525c59530c.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3c90d1051---39593669093.pdfIn PDF document text
    • http://leguido.net/files/sebumojuxinugiw.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/tafuvenopinag.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/68050945580.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133555a286a5---dizobutiruloj.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/4865239639.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/45688722091.pdfIn PDF document text
    • https://plasy.com/uploads/file/vajolagutosokiwekovoro.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/77971698087.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/pilibige.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109112001128381.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/67123189295.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/10234196008.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_off0000b296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB296 10664 bytes
SHA-256: a78fd85f3261d0bf0426fa6d9a3e56e968f763e48b803b3a634d84e0b3dbeb38
font_01_sfnt_off0000cb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 16188 bytes
SHA-256: 6a86bf1bbf5c917514adcd9873f45a4a17835d76487e99e269e08084dabf411f

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