Malicious PDF — malware analysis report

Static analysis result for SHA-256 771929c7230e898c…

MALICIOUS

PDF

84.0 KB Created: 2021-10-06 11:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 702737934aa3f09f189ee7e8d67d94d6 SHA-1: 471e7d6e31c9720cd6a93abe864de8002f70f6a5 SHA-256: 771929c7230e898ce7bff68a8230c893eb1ff51b5fb9237526173f3a7f9343e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=primo+pdf+software+free+download+for+windows+7+64+bit PDF link annotation
    • http://newkontakt.ru/userfiles/images/file/zoliwujed.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/22410352491.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/fodubijakenozuwuwoso.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/4308625819.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/58758271664.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/65308326047.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/kuwabojade.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/totigisumudas.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/52872529799.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/99341449014.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/pujujufuwakutedote.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/78551056621.pdfIn PDF document text
    • http://apex-architect.ru/images/file/dizuzasutot.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/navufoxudejenovosubo.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/87680256311.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/12047371366.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/599976b24971e41620c55abe454cafa1/45247325950.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/83709604004.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/vesuwatabewazida.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/26/file/sazonusibomagil.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7dc12b979ec022013495a2ab02bd62f4/lapavaweliwisoxakuribe.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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 18388 bytes
SHA-256: 077b56150758863808363a74a0abc8d5d3dae2c0b6cd0cb2be9fda62cf3f04fa
font_01_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 11180 bytes
SHA-256: 2c7278bb871ab486f27a5cd6b7e0bdee0fe7ca59ad98d0ed52cee7eaeced9bfc
font_02_sfnt_off00012976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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