Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4a9febff8b9f81…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 21:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 498f748b28c43cd9cbe1cd03b2aa825a SHA-1: 0aa56f29419ead2cb14be28c223355894c613877 SHA-256: ae4a9febff8b9f81e528f570fa8a1510dbb52820cb91a06e2850f25a39297a10
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it attempts to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using many links on disposable hosting, often associated with phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://alternatifhirdavat.com/upload/ckfinder/files/47985066681.pdf In PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/belobun.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/jesutiwebusiliwepudesu.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/54844531275.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/wobojidadu.pdfIn PDF document text
    • http://boxethai38.com/upload/file/47861830711.pdfIn PDF document text
    • http://zgic.ru/!upload/files/lagux.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/13559982491.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444b0dc6caf---jivotepodefilitowira.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/24262600572.pdfIn PDF document text
    • http://premo.at/userfiles/file/sozuwaxobetow.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/luxarusobajik.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/80203869995.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/retifalizazigibovabuva.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94464420148.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/livifezesewufujewelaroloz.pdfIn PDF document text
    • http://partnercable.com/files/nuxizoxufamuxezoruzotubuz.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/venam.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/werurulamezozirota.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/32051566129.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/47744496485.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/momogegupediru.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/jofewugemimapajamujekubi.pdfIn PDF document text
    • https://scalping.ir/data/files/file/78443434250.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/38590241478.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/lonikuror.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/zamebejavuvidekorebumaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=you+have+0+friends+full+episodePDF 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_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 10768 bytes
SHA-256: 784b64cd73cd9ca2c31e213ed06e20abc62a56a27ceb7355178f2a859a5563a0
font_02_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 18312 bytes
SHA-256: 0c7ed4790c57a192f313edb3fc8439cd047c809c740d909bf1dfb10a64ad3033

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