Malicious PDF — malware analysis report

Static analysis result for SHA-256 03421b104b6fcf09…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 14:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8fb511d625291ec6ad4286996319ac0 SHA-1: 70d0fb0e96eed36016b6f3f9cf527e7885dddbd3 SHA-256: 03421b104b6fcf096f5708781e478769ff6cd57fa8b8b8986ea8191e5d0581cf
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary attack pattern involves directing users to a collection of PDF files hosted across various domains, likely to distribute further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lixupeng.com/uploads/files/mufololiwazoxineka.pdf In PDF document text
    • https://cobaltinc.org/userfiles/file/72536841783.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/78608802817.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/kevugani.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/30001837249.pdfIn PDF document text
    • http://cichanski.com/Upload/file/texilo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ef41b7fd511f3a02092adcb917320686/toboxokosafovonus.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/35292222440.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/614013cb7fc78.pdfIn PDF document text
    • https://km2804.com/ckupload/files/30350717573.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/47396586833.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/lavakif.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/57860664756.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/47469070018.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/51208005259.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/muxek.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/85131080382.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613684e48cb88---kilebafezatuw.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/45501505474.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/jefutojozu.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/27634008175.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/wesujavosofiriximalerepan.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/70760186722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+extract+audio+from+video+on+iphonePDF 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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 11016 bytes
SHA-256: b8db5743c0f50bd7bce05f91c4c3659655b1204a55fe17b46c899595c9b024e0
font_02_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 17212 bytes
SHA-256: 602863cfffe2851b5b2962f16c1eb6304b54cbd05087ae94e2009927642c6fc0

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