Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01ceebb4d47aed2…

MALICIOUS

PDF

72.6 KB Created: 2021-03-28 07:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 961559d27898546b70f265c8f21ebb56 SHA-1: 8d8f1aa4b5848e40d4b308c03e8a860b955f2b6d SHA-256: b01ceebb4d47aed299a211c2e43538ac191c3990ecb28d77b8c2a6b96c2972c8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=attaccamento+e+perdita+vol+1+pdf PDF link annotation
    • http://pemutoguxo.66ghz.com/roguzejovedegujutobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fd7a4a2202c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_6059525855d34.pdfIn PDF document text
    • http://cleaner360.shop/352146359282bvd3.pdfIn PDF document text
    • http://teachersaid.fun/40444222033od4kd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369900/normal_6002bcf755c20.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/harx0gj/10237598868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_5fdb072b1f4db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5fc59ffc6729f.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/hgjiGhi/hill_climb_racing_java_games_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobonosad.rf.gd/fikonegomewarekodabino.pdfIn PDF document text
    • http://zugemixo.epizy.com/absorption_spectroscopy_method.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/59314723532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e8e5c0-be3e-4f08-b85a-ccd0eb516dfc/monogavimi.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/19773535720.pdfIn PDF document text
    • http://zuwapupefitojit.rf.gd/zudisobazijogaju.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/semesutogozelajezufavimip.pdfIn PDF document text
    • http://rogofijanititad.epizy.com/eclipse_kepler_for_java_8.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/83934807634.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/lafobexixojuzomenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0017ef5-df67-4bb6-a84d-dee4dfcb7fa7/game_theory_101_the_complete_textbook_by_william_spaniel.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_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 5224 bytes
SHA-256: bc66811ac13cdce7c7f14a04803ec8c603cf85c0d2ae46fc2460d9805df1bf0f
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 11036 bytes
SHA-256: dad73e5a4e9a0b6cbe5e9f96e0875e462ec4f4827b858cc21c96935e1b0318a7

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