Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28bf4a83d21b9b3…

MALICIOUS

PDF

101.6 KB Created: 2021-04-05 00:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 238df146935a2380ae23ced5c0c1d6bb SHA-1: cfa5478370d6f23e7b0f5799d37d0c47da926b2d SHA-256: b28bf4a83d21b9b3de7233c2709e2cc6ce0db7deeda86958759ebea04b75da85
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominently featuring a lure related to 'free redeem codes'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/strik?utm_term=how+to+get+redeem+codes+for+free PDF link annotation
    • http://ezfix.asia/kamogiv1m5x.pdfIn PDF document text
    • http://pifovabu.getenjoyment.net/jololamugivi.pdfIn PDF document text
    • http://pifumufupes.iblogger.org/67860054513.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/2007_ford_mustang_shelby_gt500_0-60gng1l.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/woxupogebelonakemegeftjidv.pdfIn PDF document text
    • http://frankiearvelo.com/universe_sandbox_2_free_download_goo881t7.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/easy_crochet_tutorial_youtubexdu7s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_60602317c8a14.pdfIn PDF document text
    • http://vumavotanumibuv.iblogger.org/fezozani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393363/normal_6032b14ba24fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafagelupuf.myartsonline.com/annabel_lee_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d8936a-7ef7-484a-b72c-11b48eaf2210/85758639112.pdfIn PDF document text
    • http://litipodetipuwi.epizy.com/60653940156.pdfIn PDF document text
    • http://magakawigola.epizy.com/28286807801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fbe28a9-4274-4cd9-b06d-5b1e2a6177bf/62648050569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb175cf-645e-4bdc-96e2-38ece31132bc/verude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d101723-7beb-4702-9340-2e080a23e181/12523763778.pdfIn PDF document text
    • http://kupuzoliku.rf.gd/79557572509.pdfIn PDF document text
    • http://gulopajekojof.epizy.com/xarikidokoxaruxime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7da725d-353b-4c30-8ef8-6f692dd7aa0e/46457571658.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 3052 bytes
SHA-256: 67ff2867ef10f80e9cf0d1df0a5d7bfc688243cfa3135db91e4a78d776f6d161
font_01_sfnt_off0001367c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367C 5152 bytes
SHA-256: 964c19eacb6d4da87b3f73918ba70ea89c454c43f75cbbec5279407b90724772
font_02_sfnt_off0001480a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480A 13040 bytes
SHA-256: 907deb6ade150108990fb816a904720b812962136e89c78077282661c8c5b380
font_03_sfnt_off00017313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17313 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833

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