Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f25979f0fbc5ee…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 17:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73bbddf66d34bf7f2f8ba3e384fef361 SHA-1: 7431e882fa937321bc9ffba3e9d7279dbfb94856 SHA-256: 73f25979f0fbc5eec0a820c59e83ec9f537d24d7cb796739dcc61709ae460264
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one identified as a link farm on disposable hosting, suggests an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://atenngo.com/admin/sites/site/documents/50210843796.pdf In PDF document text
    • http://flyingkirin.com/uploadfiles/file/030502008010.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/rabopunogukizijomevabif.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/54671430907.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vedonalovekirilu.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/53867189321.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/32383772454.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/80690455944.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/82075988061.pdfIn PDF document text
    • http://vtaky.sk/media/file/weririguduge.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/fejorisezoguselexijezow.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/fizatojaba.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/12637393580.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/tizinexufasojunede.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/kamaz.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/42886373368.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/55408323201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+set+up+a+voicemail+box+on+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_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 11160 bytes
SHA-256: 7a68c4e44eea1742ab8a8be52d931d012b9cad175b1bbdb2cbadc19a4f7a4ae9
font_01_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 17720 bytes
SHA-256: a67886556aced037f77444612aadf0691320032c5d027f0d2c5a5288a3b38bf2
font_02_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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