Malicious PDF — malware analysis report

Static analysis result for SHA-256 90890cbcb59c5e78…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 05:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52df85bfea8db340a874f8ca04568cac SHA-1: c8ae775b9e7db6ad5ede9afec8b622bba45578ee SHA-256: 90890cbcb59c5e7857b38fe2c4633a9fc49553a1bbd5d7f001d72f420dc7ebc6
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's purpose is to direct users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.biogreeno.com/cms/ckfinder/userfiles/files/98680202184.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132b843dcaab---zejazidov.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/nawogofat.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/nanikovevefudozoxap.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/24917256090.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/93196030260.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/zovesigezar.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/25694558383.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe5e1e384---73172395409.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109062105009477.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/xenobu.pdfIn PDF document text
    • http://caramelitos.sk/files/68629241727.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/fimadivi.pdfIn PDF document text
    • http://vpsystem.com/files/fck/72751461408.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/fivure.pdfIn PDF document text
    • http://redactron.com/userfiles/file/50626338320.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea0006381---1474166601.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/vavevulu.pdfIn PDF document text
    • http://byecook.com/ckupload/files/xesewopafufuf.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/33918128787.pdfIn PDF document text
    • http://szcftz.com/upload/mowomoserurivu.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/52853478380.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/wasunoruwa.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/xolulire.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/bonivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=aarp+android+appPDF 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_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6A 9924 bytes
SHA-256: e7184ab8ca40a04bed0b27cbc275556dcf92643ec276a7d9073c244b25ca1511
font_02_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 18056 bytes
SHA-256: 716ace2a0418c2ec53dae9d3600c20e412abd825b27edddbf8a6f171a8795e4d

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