Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fbe3a05d53de93…

MALICIOUS

PDF

66.4 KB Created: 2021-04-11 07:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3764f1a93f2ea5b60054437e33a236 SHA-1: 5e97c066365d1b76ea4c2a9c7f1d8c116f907ac9 SHA-256: b2fbe3a05d53de93cd55f9106717a32b846eaaea1fbb25f4c99e4f79a9604121
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains a heavily corrupted document body, suggesting an attempt to obscure malicious content. The presence of embedded URLs and a high ML classifier score indicate malicious intent, likely to trick the user into downloading a malicious payload. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.natsihwa.org.au/sites/default/files/webform/19026354442.pdf
    • https://www.dgs-interparts.be/sites/default/files/42042694998.pdf
    • https://www.woonsocketri.org/system/temporary/webform/kebadewanizokodijixupid.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/mibotemesasis.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/92207600326.pdf
    • https://aboss.by/sites/default/files/webform/10891008032.pdf
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/joxelivoresilawefuxeli.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/93477879009.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/48862039041.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=t%25C3%25A9l%25C3%25A9charger+gratuitement+des+fichier
    • https://www.healthdata.org/sites/default/files/resumes/sutuzosugogaw.pdf
    • https://lib.asu.edu/system/files/webform/sikukuditizituxabisezopel.pdf
    • https://campusrec.princeton.edu/system/files/webform/xapedejezorim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4c7.bin
dcf2e099bd58781a73815e5f3a61cc37d3f0807765071b82603db99ad1ac5cb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C7 5524 bytes
font_01_sfnt_off0000d71c.bin
99dff9773b256733cbca90860c5eef03f4d6e64a85dd3046ef9c3901cc9ce354		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 10760 bytes

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