Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a276dc16eef30f…

MALICIOUS

PDF

65.1 KB Created: 2020-11-25 11:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e57a4c99ceca71c1998cc15e5bc92e4e SHA-1: bbedd6f4655b9bb59c43b1db6c1345e8273c10e1 SHA-256: 23a276dc16eef30fbf948703f9e569a0f26bdd946780be5283ffde520f7f4a8e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to various sites. The ClamAV detection and ML classifier further support the malicious nature of the file, likely used as a phishing lure or to distribute further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/123?utm_term=scottish+or+irish+accent+crossword+clue In PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/xijokigebogalun_beruzikeru_dafilidosuw.pdfIn PDF document text
    • https://lavigumujow.weebly.com/uploads/1/3/4/4/134438710/xuzerogufom_fipujovofodozur_nolelawemasuj.pdfIn PDF document text
    • https://kupefuvewugixo.weebly.com/uploads/1/3/4/8/134849821/duwotur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/donarepemi/anti_ragging_form_2019_amanmovement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc85b5fd-07c4-4254-8ad9-5c0dba4f5d64/86379801951.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/maxovokam.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/rozegigesudabimog.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/1803441104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a9487cb-a650-418c-8d8d-a19a68108bc4/na_step_4_basic_text.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/kodata.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/kubopipizuzoxefi.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/octane_pro_350_elliptical_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e323649-99f1-427d-9cca-34725f83e2ae/47065618844.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_off0000c124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC124 5224 bytes
SHA-256: 0fafd8c72010cf99d655860955be8eccdd19460d74499fb7db133a03d85664b9
font_01_sfnt_off0000d2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 10896 bytes
SHA-256: c415028bff09356c875a19990e6dd4b007421c52b442232cc098925d88d82a90

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