Malicious PDF — malware analysis report

Static analysis result for SHA-256 9201c4e1255d3fe5…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 20:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b468a0edb7b777ec6ba3c81aa49a9d25 SHA-1: 9510a1950231bfe1b2e53799e283b43c3e3e272c SHA-256: 9201c4e1255d3fe54b5a289a10ab0790582b45103f77a0c5b0df1a31a7c68082
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The document body, though heavily obfuscated, appears to be a lure related to 'Ap bio lab 6 cellular respiration answers'. The primary heuristic firing indicates an external URI, and ClamAV detection confirms this PDF is malicious, specifically flagged as 'Pdf.Phishing.Trojan'. The embedded URL is likely used to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=ap+bio+lab+6+cellular+respiration+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375504/normal_60402fc7ba147.pdfIn PDF document text
    • https://cdn.sqhk.co/folukize/hghuMpk/fenapataxakutoruw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5ff9419a1c8fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466366/normal_6041669957a38.pdfIn PDF document text
    • http://tareworig.mywebcommunity.org/ejercicios_resueltos_de_algebra_booleana.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/garmin_dash_cam_55_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_601e020d66458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389570/normal_60023de74e12d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5ff2a172c63f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451028/normal_601a53b3a1c31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5fe44dff7689e.pdfIn PDF document text
    • https://cdn.sqhk.co/nidimejuzu/hdloPig/41740835814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7aef3e3-5ae0-4d29-9c19-bc522d12a0eb/84221888840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed7cbfe-27d2-4026-8df0-40356dc7bf44/what_is_meant_by_an_inclusive_curriculum.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/action_potential_physiology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4961160e-b512-490c-bf81-a0a526e66249/titun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e988e1-5e07-4944-9a76-fc10e8d2d831/gokuwenubuwusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24515b0d-177f-4f35-86bc-8afc9a7e5ce9/76169148438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00cd925-3349-4e16-bb0e-a908b07c31f8/fulejunalorisoxoba.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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 5300 bytes
SHA-256: 3ec6b5ecf4c5273faab2e30aebcc996c1322537cde3670d2f241f0b7f4ff6bfd
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 11836 bytes
SHA-256: 0a1e2b83bf0db5b4ec23123a89d68177651258c71122c1446a7535642e523140

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