Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b733d4324efacc…

MALICIOUS

PDF

80.0 KB Created: 2021-02-23 07:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a276f3183bf30893c68dafcc29a8956c SHA-1: 667bc4630a12578f8885275044e47877c8eea2e7 SHA-256: 97b733d4324efacc992ff58ee78a52b42ffc3cdda111c6e2368ded8a3a58cb4d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure designed to redirect users to external sites.

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://jottigo.ru/strik?utm_term=stephen+hawking+quotes+about+his+life PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5fcaf74645092.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/fhiwhbX/13272807879.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/hdgigQH/howard_wolowitz_best_moments.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413735/normal_6011dddc1c228.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/HbjajhF/87758197302.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/2hbbhfI/franklin_mint_falling_ball_clock.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/5yIic3N/jedefe.pdfIn PDF document text
    • https://lazogipinu.weebly.com/uploads/1/3/1/0/131069887/5ab4b6b4ba2e1.pdfIn PDF document text
    • https://cdn.sqhk.co/nafolekuge/WjIichx/2_player_cooking_games_ps4.pdfIn PDF document text
    • https://mevukufidax.weebly.com/uploads/1/3/1/3/131379039/jebomabeluza.pdfIn PDF document text
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/libemok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepawelifebin.rf.gd/how_much_does_it_cost_to_convert_auto_to_manual.pdfIn PDF document text
    • http://fatapiwav.rf.gd/22_gauge_stainless_steel_sheet_thickness.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5592 bytes
SHA-256: 30320adf0b5f20727118568b63f104a770c6de8581d2018263ae3b451e88e3fc
font_01_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 10588 bytes
SHA-256: c93bbc1ebe7896539d465d79d4d0e5fa03a7feeea27e5b1bb65ad9088de41603
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 16164 bytes
SHA-256: 1ee2fcd01472a4a169dc06bce7a946a041847037e962446b6087ad25f04728e5

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