Malicious PDF — malware analysis report

Static analysis result for SHA-256 921c0cbd16ce21cb…

MALICIOUS

PDF

81.1 KB Created: 2021-02-27 23:28:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9e5458f1f9667a9ffed41f25ab0b6f89 SHA-1: 48cd91025c84483a65e368e7a20bd79022fa4c25 SHA-256: 921c0cbd16ce21cb6dc4d946329553dbc26ef596de5ac236edc0736840575a37
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to screenwriting terms, masking the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/123?utm_term=list+of+screenwriting+terms PDF link annotation
    • http://zoguponuwuxoli.medianewsonline.com/vivovejobilew.pdfIn PDF document text
    • http://baderezu.scienceontheweb.net/wagarodotivujozotijesuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_60265768eaf69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451756/normal_5ffca5743be41.pdfIn PDF document text
    • http://hookup153.space/7629986293302oub.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/22932112690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470542/normal_5fca009008ab0.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/graco_modes_jogger_se_stroller_reviews.pdfIn PDF document text
    • http://streichpack.online/download_slumdog_millionaire_full_moqhvjn.pdfIn PDF document text
    • http://befigter.xyz/893359193264gkfi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450504/normal_5fc7661027550.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/academic_reading_and_writing_course_syllabus.pdfIn PDF document text
    • http://tersq.space/ubisoft_report_bug_assassin_s_creed_odyssey4n22i.pdfIn PDF document text
    • http://sfhgfje5df.xyz/spreadsheet_for_calculating_adjusted_cost_basee1bdn.pdfIn PDF document text
    • http://organicsss.space/fobijoremuvinovalo3wnro.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/94341041675.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/4hhGWgc/70398385735.pdfIn PDF document text
    • http://tonagruz.ru/vaxasalijomaguwosadodusitwpie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jeborawaleko.atwebpages.com/2520612547.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 4780 bytes
SHA-256: b6f4e85703dabf0934880140b5a6a3b4b50fdd938517a5d153a64a78df6f4b23
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 10384 bytes
SHA-256: 376c68956a1134eec5c98e3ef73da028f307dc18e131c92008f91d70720bddcd
font_02_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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