Malicious PDF — malware analysis report

Static analysis result for SHA-256 70db998fa66af6d7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 08:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78586c0f50bc47e360c4e1968e6feaaa SHA-1: eef495e4142eceef84693a7eba39918e2e2e2c31 SHA-256: 70db998fa66af6d7b8af0b34aae42d48bc9a90ff440a8e9f4b5da2f146b3e70e
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 embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to distribute further malicious content. The PDF structure and embedded links are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://nepalipublisher.com/ckfinder/userfiles/files/fimipumibufagi.pdf In PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/57238916356.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/79314354206.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/23974650594.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090310513173499.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/samadexozevapufelupavos.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137025409684---60109178650.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/22562826184.pdfIn PDF document text
    • http://artepcb.com/upload/files/pomidanu.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/rezabolugidakozos.pdfIn PDF document text
    • http://melvin.cz/data/8458547814.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/79441115496.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/75226932848.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/gujijeko.pdfIn PDF document text
    • https://digireg.org/upload/togipobisasuxak.pdfIn PDF document text
    • http://mestan.by/images/file/71606773452.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/92721038015.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/62485388215.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/domefufojukat.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/jumusona.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/gajedatobulogi.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/videsozoju.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/lurevosos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=security+and+antivirus+for+androidPDF 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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 16824 bytes
SHA-256: aec8853f5c4422a356c16c89a0ed48461647f6023a688dae22fc3c1df9292c90
font_01_sfnt_off00010768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 10776 bytes
SHA-256: 0f2f3c7b920e83f361a5791cf0ef3daa604810311b02a6673609b76352b0d841
font_02_sfnt_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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