Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67425a4e7d3d7c2…

MALICIOUS

PDF

70.7 KB Created: 2021-04-26 00:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: cc08d9df50d82e65047d44678d1e34a1 SHA-1: e5f70ac3fdf893ab10f1c3386ddc2b6c15b4460b SHA-256: f67425a4e7d3d7c27a21785de7e6951ce40d8c418329cf18e9d3b61bdcae291e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDFs hosted on various domains, suggesting a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious content. The document body, though heavily obfuscated, contains text related to 'Briggs and Stratton engine repair manual free', indicating a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vectorcorp.net/sites/default/files/webform/resume/30106672217.pdf In PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/17654710786.pdfIn PDF document text
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/zavemazawutojene.pdfIn PDF document text
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/65827293628.pdfIn PDF document text
    • https://www.a1touchsolution.nl/sites/default/files/wozupidojenebimovom.pdfIn PDF document text
    • https://www.dgs-interparts.be/sites/default/files/60165950635.pdfIn PDF document text
    • https://www.jwico.com/sites/default/files/webform/49109440539.pdfIn PDF document text
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/31843799141.pdfIn PDF document text
    • https://www.mainephilanthropy.org/sites/default/files/ziladiweropisikiforab.pdfIn PDF document text
    • https://www.uts.cw/sites/default/files/webform/nukuromenalifaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=briggs+and+stratton+engine+repair+manual+freePDF link annotation
    • https://printandmail.princeton.edu/system/files/webform/zixulupuritijidegebi.pdfIn PDF document text
    • https://www.healthdata.org/sites/default/files/resumes/jojilekavoxojomoz.pdfIn PDF document text
    • https://drones.princeton.edu/system/files/webform/61493424170.pdfIn PDF document text
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/xegenaxug.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD672 5408 bytes
SHA-256: c3f2d5372b7087fa8caa364550e136107367136168c82ac2f6c9e28e3aa4bdb8
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 10872 bytes
SHA-256: a6884feff6b745407d8a905be0ccb55349e06288c92c6c0b2bb77d1f0fca894d

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