Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf68b1d53f3acc0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 00:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 359ab71a62aee40ac035082864351423 SHA-1: b22e7e764c5bd60c46c2ebff3a353aad5aace8c5 SHA-256: 1bf68b1d53f3acc05cfa07eae86825cfc5ba8cd489561a9b0be179ab971921ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of urgency language further supports a phishing pretext. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ppuhperspektywa.pl/files/edytor/file/20216537620.pdf In PDF document text
    • http://shendaoguoji.com/data/attachment/file/fukatetozamowojeliki.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38647338765.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/masuze.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/potokup.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/22276380651.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161416d83925d1---vidukavovudukaxawadule.pdfIn PDF document text
    • https://edex.co/userfiles/files/79108282733.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/90388942676.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/posafejavo.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/bafebumesamas.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/88686743110.pdfIn PDF document text
    • http://mobil-tech.com/files/supumoropovoxo.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/zefigite.pdfIn PDF document text
    • http://dsagco.com/Upload/file/13700569493.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/nifofaf.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/midefijujanegemijosi.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/selafoxe.pdfIn PDF document text
    • https://everestart.com/images/stories/file/nuzoraxijuzejoribumajevog.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/70175219473.pdfIn PDF document text
    • http://darstin.com/userfiles/files/20749794816.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/89991970579.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/71367807415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=toon+app+photo+editorPDF 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_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 17992 bytes
SHA-256: 8b75a86d4c4edb4082a5cb6740ba300cdb17cbe0b54c5cd855e2859a25b236db
font_01_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 10236 bytes
SHA-256: 316ca1965b74ab93bb80b1ec0456b4174ab7feba02052f3803454db1db3b6432

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