Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f1fc69e07d0b0b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 01:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0d41b5d7d3c11f0cce065ea15ce122ce SHA-1: 594f94cd6bc32f8fe6f988413b96e2726b10d04f SHA-256: b2f1fc69e07d0b0b16e5212a5e6595584ed40f3b3549f347c4b698cfb148641b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to obscure the true destination, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dagmar-e.de/userfiles/file/lejekagakezukekikul.pdf In PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/muniboligixoriretim.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210912035850_klgl90.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/99936025289.pdfIn PDF document text
    • https://computerzone.pk/file/guwano.pdfIn PDF document text
    • http://www.bash.cl/media/file/93512330352.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/lanivazujepigitug.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/53618230115.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/tomukixom.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/67596182899.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20210920061423.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/zafuzugoto.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/34607639807.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/80436062170.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/63214012941.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/88468894749.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/wefubejarokediwanafebeba.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/12108063315.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/zedexajafiwi.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/2304020421.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f688332a184f5091cc58761a85a88d3a/gajuguvujojutesejorapes.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/66545898073.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210917_200951_8397.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/32046795074.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/jikudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=enter+the+gungeonPDF link annotation
    • 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://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_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 18020 bytes
SHA-256: f4eaa0fe973f2f85428952dd7be985ab62d1a016f0fd5ec7fbaab234a140b938
font_01_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 10000 bytes
SHA-256: 5dceaaa09bb989fa07333de6e47d4efec85c395ca57c0c2e64e92cf44e881812