Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c5cd128a175a0c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 19:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0cdbc466b8cde4cf26db300421b13d3b SHA-1: 5ef57c92b0df87b4afafe84214530fa488b4a338 SHA-256: b1c5cd128a175a0cf5ab171053ebd00909bb94f29ae638987478762195158eaa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The presence of these links suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://health-bridge.in/upload/file/76812029412.pdf In PDF document text
    • http://eventclub.pl/userfiles/file/35648944197.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/20040840444.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/wugetupimilotemuzonup.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/71948285353.pdfIn PDF document text
    • http://zeci.nl/im/image/guvopejiniseral.pdfIn PDF document text
    • https://ms02bet.com/contents/files/zomowafemekevuzil.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/rulifesaxefet.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/juregoturexolavoke.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/65877311407.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/jibigu.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/96596172105.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gegifigugatuvixoroku.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/71906750587.pdfIn PDF document text
    • https://finliz.lt/i/File/suvisenuxaxivomugifexit.pdfIn PDF document text
    • http://land89.com/ckupload/files/bekirafegeloki.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210904_084610.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5491858c---xiguk.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30973450786.pdfIn PDF document text
    • http://citra.cl/userfiles/file/97056516544.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/nebolutadukanoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=4k+desktop+live+wallpaperPDF 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_off0000d2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 10508 bytes
SHA-256: 9b5a8073efd18618914a1c52148c8c945fed76ab7a3cacb38a9d1470c4603c0d
font_01_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 17768 bytes
SHA-256: f0607f80067bb2a283b4a5e525d1021c0530060fd25670c46b99928278ea768b
font_02_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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