Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7a9492cb4b0693…

MALICIOUS

PDF

89.1 KB Created: 2021-09-23 02:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93add97e1f22134431ac76add3bc985d SHA-1: ae660673206ba3bf5ceb760629992220924f9692 SHA-256: 2a7a9492cb4b069354c8e07b4ff2abbdf31be10a7cfdd315c81882b090b03f23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a redirector, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards a tactic of luring users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://coretry.ru/uplcv?utm_term=the+smell+of+us+full+movie+watch+online+free PDF link annotation
    • http://tdjl.com/uploadfile/file///2021091416511143.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/wijevutami.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/49287478400.pdfIn PDF document text
    • http://uteambio.com/upload/files/rizirovokevedimalolo.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/pozedopotif.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109061755585915.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/48764064609.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/80273105616.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/vileriwizogew.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/9038014764.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/42911385569.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/34494601654.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/14178302559.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210916142706536535.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/lobojigagagibud.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131797e099b4---3997453102.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/38791815554.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/wizozetameguxubadatixu.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/bejuzibivodizinuwajepoza.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139e88d76c8b---51235262057.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/31651406541.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/423888120.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_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 17596 bytes
SHA-256: e97fadfa135ad897a49c3f997bd68a4c46df3def52a9fc0cc05cf1e5d0439212
font_01_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 10816 bytes
SHA-256: 53f8c879b8a03b852f54daffedaba55b0d6abb66b4398996d197a6a83b4d88fb
font_02_sfnt_off00013e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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