Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97c3576d7361e14…

MALICIOUS

PDF

102.2 KB Created: 2021-09-12 12:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 04d14927a38649d7662c385bda936a78 SHA-1: ebdc1d34e6beb603a525c6bf5107755eeac0ea09 SHA-256: c97c3576d7361e14abcf8311bbf36ac6bef9205ed2074ce00741ea2ed74f865d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution campaign. It contains numerous embedded URLs pointing to disposable domains, forming a link farm, which is a common tactic for distributing malicious content or redirecting users to phishing sites. The presence of many distinct, low-reputation domains suggests an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://jl-vacuum.com/upload/files/pidisomu.pdf In PDF document text
    • http://lafenicealcamo.it/userfiles/files/52452470149.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/tibesedonusagekegukewuwo.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/bexebew.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/17203983289.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/fugibujuzemogoxidojonar.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/25914932503.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/10889629582.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/dabfb06968dfbf6bf11f1bdf08d01135/48103937103.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/pidiboruperalajib.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/xobizibonitove.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/19866421112.pdfIn PDF document text
    • http://quinta.cl/upload/files/miditugupupaxekolazasopom.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/27932310839.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/rifewudivozuzawa.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/32949106432.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/64272834246.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/towetobavikatalotevinusu.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/viludurowemepopu.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/vadap.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136be9ce4a5f---105846754.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/16550301348.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/penasubomokunugubipigasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gi+joe+snake+eyes+2021PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00010b3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B3B 17416 bytes
SHA-256: 742e1cff84614f6fc55ffc4d3404de345630e8828360c6834f35357a878e91a2
font_01_sfnt_off0001252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 19780 bytes
SHA-256: a9067333dfb71c720c5d1988e77be7c46239473a2a14747f68ea98d01a66c9b0
font_03_sfnt_off00017158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17158 10524 bytes
SHA-256: be6f7ea8da7d04385f390d1797e440940b8e6ca6209d283758f12fdfb38c3f35