Malicious PDF — malware analysis report

Static analysis result for SHA-256 177eec252f3a107c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 00:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0629bab5d80397156295cd2417ed1844 SHA-1: fc85d1de9d6f40941fc681999760c0923452c177 SHA-256: 177eec252f3a107c60089884966be32a62c7ec623d4513747c2d2e28b728a0f2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains that appear to be used for hosting malicious files, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The file's structure and the nature of the URLs suggest it is designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.anclupnapoli.it/userfiles/file/dejuwakorubipakilo.pdf In PDF document text
    • http://inbiosa.eu/static/cfiles/files/lepiwuxopukug.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/52863026012.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/rumapijalusuluv.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/kijituvugeditupujog.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/budijenakugugirapobuwa.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/60514670172.pdfIn PDF document text
    • http://annabarons.com/files/files/zinavigo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3841e115e---fimalifis.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090417490273499.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/64440892505.pdfIn PDF document text
    • https://yifff.se/userfiles/file/jusadunobirow.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/raxafowogugimevofaluzefud.pdfIn PDF document text
    • http://ranch.pl/files/file/ludepadaridaw.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/55904811853.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ohe3cvj7r0hshacnbhuf7smqn2/16563043898.pdfIn PDF document text
    • http://simoncaulkin.com/images/29687810023.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/7490730054.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/selubokeg.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1632000240.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/loduga.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/34130576803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=intro+cave+apkPDF 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_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 10168 bytes
SHA-256: 924296b33f935e279d0b20f4a40845e30ec39ce01846971b9c0c641037449ed4
font_01_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 17400 bytes
SHA-256: 8c34c4f7dc2bcb7a38e3762dad3e5b303d02bec37b371bec65de2fdc134daf5a
font_02_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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