Malicious PDF — malware analysis report

Static analysis result for SHA-256 86031c50dbd4967b…

MALICIOUS

PDF

77.3 KB Created: 2021-09-11 07:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4119eaf9b80528614d04a49e510ecca SHA-1: ffe3c195bc06ac4c182ec2120f705160dbc5c5f0 SHA-256: 86031c50dbd4967b46c3e72f4ced1c70a3bcd4e77d7f9f85e98ab7732bf6aeb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malware. It contains numerous embedded URLs, many pointing to disposable hosting and structured as link farms, suggesting an attempt to distribute or redirect to malicious content. The presence of a URL with 'pc building simulator download android' in the UTM term further supports the lure of downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=pc+building+simulator+download+android PDF link annotation
    • http://the-bom.kr/upfile/files/bilegekotimike.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd7a1402e---vojunedejegugi.pdfIn PDF document text
    • http://eventechsite.com/files/files/polobol.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/52843832890.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/xuxazexopolojer.pdfIn PDF document text
    • http://aven.su/userfiles/file/88019419773.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/26163290447.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/97559196931.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/81546169048.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/wofodonen.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/53979828131.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/takopuweforuzole.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/xefugilubomelaso.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/44791555236.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/sidevivun.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/51884494214.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/40123583600.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/jajaserasorufuvijaviragek.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/75311802005.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/zurivegumifoboberadife.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd8a77a01---64752579333.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/kamiwet.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/21121796557.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210910173807_NzYwNTI3OTMyMjg=.pdfIn PDF document text
    • 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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 10908 bytes
SHA-256: 765d93a32353f31a36edb0fe6e67850b94cc5504fbf806d120f42a9a76a09766
font_01_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 16896 bytes
SHA-256: 70420acac8778515f6a2b38ce69aebfc64922467921f2704a6f9ed6b82af2b95
font_02_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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