Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf999233ee6ae03e…

MALICIOUS

PDF

69.1 KB Created: 2020-12-14 07:26:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1df1069eeed662b7180e2f9da6d12717 SHA-1: 30e7adfa3c018dbf07dae66b41cf37245b12f056 SHA-256: bf999233ee6ae03e4f1cc996d1bbcf1395741797107d280d33cd8279e776c1e0
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains a critical finding for brand-impersonation credential phishing, specifically targeting Facebook. The document body, though heavily obfuscated, suggests a lure related to 'exponential function questions and answers'. The presence of external URIs and embedded URLs, particularly the redirector URL leading to a PDF hosted on weebly.com, indicates a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/gupofe.pdf.
  • 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://traffset.ru/strik?utm_term=exponential+function+questions+and+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366632/normal_5fc9217d705d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fd6ef9e6c329.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/gupofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_5fc3593d5894c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5fc684561d8e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f06b104edf1d7780fa74/t/5fc1deadf8cdb769c627b824/1606540984495/introduction_to_sociology_henry_tischler_10th_edition.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b80e5bcb0228a28e2589/t/5fc6b6a61d106d256ba93870/1606858406377/4561657567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e43f799-1125-4b43-a29c-9f63f9ed3410/44175649762.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e46f24b06a7eb3ff1788/t/5fc0fa78e6d49a06bbb4ecd5/1606482555642/preston_county_animal_shelter_facebook.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_off0000ca09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA09 5392 bytes
SHA-256: 5d9ae3f4028ab4f58b9614380d3909fbecd213e04f5bcc6714bfb0b32b18d15b
font_01_sfnt_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 12740 bytes
SHA-256: c88adc524831859e578a9e9b08c739d844ebc74706e2eaabedc8e6519ca56ef3

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