Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2bbb4a760e49244…

MALICIOUS

PDF

91.5 KB Created: 2021-06-06 03:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 382d41e79344c0ede6386a42ff6ddbdd SHA-1: 21c24507a0e0d61be12351498e2e73dec5d2e777 SHA-256: e2bbb4a760e4924453163a9f8bdea015f63458aa3f7be2341e589ee55fd6944e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that is likely part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains strings that suggest a lure related to software serials, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://medvor.ru/pbw?utm_term=serial+para+easeus+data+recovery+wizard+13.5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453337/normal_601dbc22e1b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_6032cb34e895e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5fe550d47d046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469101/normal_601d9cd93b7f0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4407724/normal_60b19d2cd5e1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366407/normal_5fe4bc317684d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427538/normal_5ffabd9eef7a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_6019b067978a4.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/62d2e86e-1077-4220-951e-f871d6861ff4/tilanu.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144626139/how_much_is_the_behind_the_wheel_test_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625bd60b-ab73-4041-a307-1d5d21638373/conair_clipper_attachments.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/nabard_agriculture_and_rural_development_syllabus.pdfIn PDF document text
    • http://zalemofe.pbworks.com/f/72815533001.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144413268/florida_civics_economics_and_geography_teacher_edition.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/37686807716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901f5809-3141-4f0b-ad68-6ccb8c0a9362/ketezunofavodowawogobire.pdfIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144612276/dewagivaka.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144472635/microsoft_plus_superpack_para_windows_xp.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/w/file/fetch/144688224/red_dead_redemption_2_online_moonshine_mission_list.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/maytag_3000_series_dryer_manual.pdfIn PDF document text
    • http://kekivozafiko.pbworks.com/f/wofik.pdfIn PDF document text
    • http://ridelox.pbworks.com/w/file/fetch/144469008/fedex_printing_prices.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 4364 bytes
SHA-256: 54fcdc41a104ea288190ba7a9cb99fd4d770e7379b1b0374049d3c3756cdd1a5
font_01_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 5844 bytes
SHA-256: 028deaa80d4ffbd901a5bce136838015ec31cb61915d7d7face30cff6d10e400
font_02_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 20644 bytes
SHA-256: 9849568027d5725b3d515c0b2a3e426f7f43bcc7237bcd22ce8ac1ddd9a0eaba
font_03_sfnt_off00014756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14756 16908 bytes
SHA-256: 6ed0f2974d665dc7170ed5bf755dda30f768b4f652685828f4858cd2f21a5fa9