Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ae4fa5306b7e52…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 08:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cae44dc890e231cf32c3b93883d1f633 SHA-1: 713aeec6d723bba6dd4e5d095345e9ecd092fd12 SHA-256: 01ae4fa5306b7e52125f4e20e9dc42fb89a3f59b49f0ebf1966276a185240bd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting, suggests a phishing or link-farming scheme. Although no scripts were extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

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 https://cructi.ru/uplcv?utm_term=smb+android+windows+10 PDF link annotation
    • https://hinodecoder.com/userfiles/file/nokesoz.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/96747609434.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/89110465815.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/kevitixeputajezobexa.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/59507912060.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/zabisatilenusuf.pdfIn PDF document text
    • https://cncunse.com/d/files/tavatove.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8dqettlbfb5vp8pg7hs4p4rsrr/saketamewotomaxapogiwok.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/83820733687.pdfIn PDF document text
    • http://vhshf.de/File/7976660218.pdfIn PDF document text
    • http://packamate.com/userfiles/sigasalidigojepasasedel.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161329c5623d74---80730522094.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/kesoruwe.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/75764380717.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/28435499632.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/figefiwelozitoji.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/51490076877.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/xozetimum.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/lowikufikukegu.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/xizazube.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/loxulexunu.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210908031100.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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 10608 bytes
SHA-256: 9ebaeec2ccffb98ebece6afa2d0c1fa69417adabdd859d4702fa1a4860cc3dc4
font_01_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 17328 bytes
SHA-256: 6861456771668af9401a0d20653eedff4e4d6f3d673be9c1ca20866fd393e78a

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