Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e44c4c1ef8e308…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 12:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d21f921895a2becc4740d46a2f7d0e8 SHA-1: 2a99138629b20f28d119c74e503bc4f16d5bf500 SHA-256: f5e44c4c1ef8e30819535e54cc69fbc44708372b5d913827dfa284c7af9c0288
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm with numerous embedded URLs, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of many external links points towards an attempt to redirect users to potentially harmful 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://archissimo.eu/userfiles/files/dizamojutatakimawa.pdf In PDF document text
    • https://chulintemple.org/CKEdit/upload/files/jikojuvetijogalujebano.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210914_031CF4B63E12BCFB.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/fagefogaxemezejimo.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/nilulewiw.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/menigivabudidozuzaxofof.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/xizojuvewiwurolaxoj.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a900b557ff814b0af2d8b590eb9b40fc/surupedilidorelan.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/laxon.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16146634b81adc---3499661243.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/sotuxowidexebixekaro.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/20679030431.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210905_C4DBA4872BBB945A.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/20619204295.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/9249699469.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/17885120436.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/90868511821.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/42223470198.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/94145879347.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/69096996301.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/xefuwupedolot.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/pivetuzegan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=8+ball+pool+auto+aimPDF 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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 10260 bytes
SHA-256: bb47ede469cc58b2ceb0f5aa172bb79cf52f5ccf6add8f023f3887b0369931df
font_01_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 17796 bytes
SHA-256: 74ba7c5c41f693e51af07c9fdfffa9acd28c33a939d5689c3187dccb8bf5644e

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