Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94da48bf9c5a74f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 05:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae81a99384e4b01769ceac0be3b675fb SHA-1: 0c4f2a78652a794495f4049e585aa0110071f80a SHA-256: a94da48bf9c5a74f595db786615231b79d2d794198814ff229446ae3034fc73c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm and disposable hosting characteristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://kujainspectors.com/candyticket/uploads/page_images/files/toxijifokawiwovaxakud.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/zolufiziwe.pdf
    • http://bienchidan.org/uploads/files/6774489156.pdf
    • http://fipjp.com/userfiles/file/53632313504.pdf
    • http://www.fdconsult.qa/public/uploads/cms_files/4825342030.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5116d7c4636782090f48c09620d43a97/52870903515.pdf
    • http://valeneighbors.com/userimages/kofesusegutuwemoduxal.pdf
    • https://shidoremicrosys.com/media/20570024591.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/ravawanoxejobotatuvufu.pdf
    • http://ecohort.com/userfiles/files/mamivunazi.pdf
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/41965016906.pdf
    • http://studioarchoggianiepartners.it/userfiles/files/92423127245.pdf
    • https://remini.hu/userfiles/file/63406975121.pdf
    • https://luatsubienhoa.com/upload/ck/files/45862360286.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572f9de616---numurekogoridepulapet.pdf
    • http://vetranhtuong.info/luutru/files/8597813993.pdf
    • http://intertravel.hu/_user/file/melapejasuxibetof.pdf
    • https://fertilizerproductionprocess.com/d/files/dibexofefijidaloreta.pdf
    • http://brukbet.com/user_images/file/43871062205.pdf
    • https://www.almuhja.com/ckfinder/userfiles/files/nijetesofa.pdf
    • http://gamax-moto.cz/data/dokumenty/60631482814.pdf
    • http://szerecsengyogyszertar.hu/editor_up/sasepuvodi.pdf
    • http://chpcentre.com/files/file/97716653213.pdf
    • https://kcharp.com/ckfinder/userfiles/files/gixazakegevire.pdf
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/memikamapo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=transformers+prime+games+free+download+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b034.bin
bbbcb03ea6fe9ed4019734a549905eb4bc48857dbcca257065315be7b28c243b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 10792 bytes
font_01_sfnt_off0000c8da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 16792 bytes
font_02_sfnt_off0000e0ec.bin
63b8d625a84fdd0f9bcadf66e8e364368cf73488d88179625d6df5d934150aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 14516 bytes

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