Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5651cf2eeb8a054…

MALICIOUS

PDF

77.5 KB Created: 2021-09-14 10:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aef7e42180d2568df2d4dc5940a5e337 SHA-1: 93f5abd6133241270eeae4515de87104bf0d8f87 SHA-256: d5651cf2eeb8a0549a1018e049b948719f6b8f9b07b6458dfb22db82ff74d66c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to disposable hosts, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://digireg.se/upload/93822398686.pdf In PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/15117605823.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/bifofiri.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/mediwatigakedax.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/pedeme.pdfIn PDF document text
    • http://manu-transport.com/documents/file/rorenojawanipapewusazizu.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/mugugotofagigadomef.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/19583721248.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/najujedexigoxo.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/rizunawafo.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/zafivenulevomogeka.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/97281852577.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/26670901294.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/natefekatujoviwumudirewa.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/3299371392.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/1028737442.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/83733246945.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/sijalugemezorisudamev.pdfIn PDF document text
    • https://windsbs.biz/files/file/76416890710.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/13120267430.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/sixuxobujanidigogin.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021910132664314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=huawei+mediapad+t3+10+custom+firmwarePDF 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_off0000c910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 11156 bytes
SHA-256: a60bf307ee16738852953fde0d77fe28a12bc53bded81acfb94bd086b195e79c
font_02_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 17464 bytes
SHA-256: aa5a5cf7f44f78b258bdc9738ba0823937fa4bf0cb169a2794ebe5a26a48df62

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