Malicious PDF — malware analysis report

Static analysis result for SHA-256 05967411c4bfcf11…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 22:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68c3e91b0d4b54b1a69156d8582fe5d6 SHA-1: 0f563305bc37e9b273b220ae42213131365dd9c0 SHA-256: 05967411c4bfcf11a9ebbc1b0d0dbd82c51efbd12c606a3a2c9465e86994e97d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the high number of distinct hosts suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=how+to+send+videos+on+android+phone PDF link annotation
    • https://ddtoyz.com/ckfinder/userfiles/files/41898533549.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/zivozoxag.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/91118227095.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/87112175365.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/49834630173.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/93203677265.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/wikoloporotunob.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/3981307215.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191382609200.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/dokulumubewagu.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210908_06E93B4B8F1F92A8.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090118012652.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/liluxedekawupemenisuniwos.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/822545711.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613005f2ed39f---dorabuj.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109151103339644.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/42823143522.pdfIn PDF document text
    • http://flexa.cz/docs/file/lebenepurofezo.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/zenipikoxunonabaramileke.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614015c78ef78---busagoverawapexifotozowi.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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 18272 bytes
SHA-256: 2c781ba58ea8098dac8d9c06ea1d1613b5d19e78915b99d8598136f2549c7889
font_01_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8B 10588 bytes
SHA-256: 0c67fe72f70a204c0dd5cfcf3393fcd7d1bd84cf6d7bba8a6188e36ff65da14f

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