Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bb7e5b4d7a8d37…

MALICIOUS

PDF

70.2 KB Created: 2021-04-04 14:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 083585ccf382cb23fbca729030aa205f SHA-1: d5cd929a9622131eb16adb57d6aee17c3b961784 SHA-256: 97bb7e5b4d7a8d37de22435316734d90dbbcc724e00a70859d5738c278a54800
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a 'geometry construction worksheet', a common pretext for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://vilenefex.ru/wix?keyword=geometry+construction+worksheet PDF link annotation
    • http://opit.space/what_is_a_zero_waste_store9ezm6.pdfIn PDF document text
    • http://copyrightsupporteds.com/gafafalozasapuvibitokijunq9k45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_601cb2ebb1fc2.pdfIn PDF document text
    • http://itali-big.space/16270959799t6tkd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474989/normal_5fe140d60ecb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_5fd67db09ec62.pdfIn PDF document text
    • http://nuverlites.online/92577934870ta9r0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391925/normal_5fd03ea970c59.pdfIn PDF document text
    • https://cdn.sqhk.co/bovavadas/gfbiegc/alchemy_meaning_in_tamil.pdfIn PDF document text
    • http://nikaold.site/agricultural_sciences_grade_12_guide03tej.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/ihhih42/android_avd_emulator_root.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_60261f5e28e1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d787a32c-196b-4e99-9c98-3ae3c28023f9.filesusr.com/ugd/05b469_43862c32851646dc9e0dfddf8027b559.pdf?index=trueIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_8916da63d9244a2db1c9bcc7c8c98791.pdf?index=trueIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_c679c5529aed4dfdaac4b6b40271e5e5.pdf?index=trueIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_71d98539ad794195b5c246e58dfecf55.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_7ed5b4077e3a402eb76a42418c9f5133.pdf?index=trueIn 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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 5088 bytes
SHA-256: 4cd8a022c2eefeedc638edf68851f6b076667f0b14f82eaca6bc58cc30ed6179
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 10356 bytes
SHA-256: 957610b3cad31cbf8cc7b0a91169c84981520706d0370cdc25b2c0a61071a399

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