Malicious PDF — malware analysis report

Static analysis result for SHA-256 530f38849049fe35…

MALICIOUS

PDF

84.6 KB Created: 2021-09-22 16:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3795417a2d2c6b01c3c2ae4951b13c1f SHA-1: 8cc210d9cfdaa4ccabd949a6485e94bf34448b23 SHA-256: 530f38849049fe357d0189ceb4bacd98591458258d8f24e2ee14688622e0c80d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and ClamAV detected it as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ms01bet.com/contents/files/vixopowebixajiki.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613246e4caa46---57138710012.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/22360146313.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210904_231952.pdfIn PDF document text
    • http://fitviewer.de/files/file/13925390267.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/5232917556.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/39797175622.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/11621128335.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/49731008456.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/56829997628.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/02bafe665598d3c0e7045fd4b3762921/20721463946.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/25802347907.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/140211467856.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/merinezojotawusezesuwuro.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/nulojusepiza.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/52556642064.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210909081329.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/9821867484.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/95751376350.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/30203746445.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/14856967928.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/muxex.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/zuzufexuxadusud.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/24584037263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=interstitial+ads+android+studioPDF 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_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 17820 bytes
SHA-256: b6e1a93334a6554183bb117e97e0b813c16d41ef9d035537acfbe19d993faa19
font_02_sfnt_off00012d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D91 10292 bytes
SHA-256: e3aa50582d630995ef4f8c38fdbecf60276e91e7c788e463d418e6c17f9a81da

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