Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56050f9ca5d1bdb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 10:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5233dc1cdc9d2d00c903687d20b8523a SHA-1: 673620b36ffe294d8e3367498ce8a8db3b87f7d8 SHA-256: a56050f9ca5d1bdbefeca44ca66b9a7283fb6196663b6444f9dd53e49c14e3a2
126 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 embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is used as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef48b05306---zivobajigovatojimavobil.pdf In PDF document text
    • https://tempatpasang.com/contents/files/65129614825.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/defodalamasusenuj.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/luwirofunub.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/tebalureda.pdfIn PDF document text
    • https://wsbtitan.com/images/file/92506257985.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/zuzijozepumureraxif.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/22592854077.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/viravarexobajine.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/zuxonezarurosepoxewuviwe.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/renudunuvodubi.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/niparilatuginibikonusewe.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/mijupifosatarugofamiwir.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/vaginodifimelu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366586d9a54---narorijil.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/22600592650.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/56114376058.pdfIn PDF document text
    • https://htchninc.com/d/files/tamodimuj.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/naxipapisabot.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/30067785534.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/69156664675.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/66386501033.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109161009266187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=attack+on+titan+manga+vol+1+pdfPDF 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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 17624 bytes
SHA-256: 63cb7e010a7dccea1ebcfc54c70e57b38834b8eef06e74d5f543405783a143da
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 10756 bytes
SHA-256: 918140f2c67f6614ec7bd4ef880a2f56449f01bda51f4aac3ffc1ec039738a55
font_02_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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