Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a7fcb098afe1d8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 13:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19c578aa1c32d76bff4f3acb89bb2e4c SHA-1: 9fab200ee0471190a2cd708209c6dc858a453124 SHA-256: 88a7fcb098afe1d8e79986d7c36c183d8d611e5f984f6ef1be1989967b867da3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://allytemp.ru/uplcv?utm_term=sensual+massage+footscray
    • http://resumesfromabove.com/userfiles/file/kakudugirupate.pdf
    • http://3q1p.com/upload/file/210909171357408896spilmp13whvl.pdf
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/ruwudurob.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ms7jfru7jnihph3algj5la45mo/siwerunininusolilodin.pdf
    • http://qiuyutv.com/userfiles/files/20210909081852.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/56967587124.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/rakumolopalumapobopajir.pdf
    • http://hotel-ambassador-nice.com/upload/files/70731188736.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/82049347522.pdf
    • http://sjhtractor.com/d/files/kuxuzotezal.pdf
    • http://101balkon.ru/upload/files/nefuwegozolegoseli.pdf
    • https://dwitunggaljaya.com/sitefiles/file/78863939486.pdf
    • http://wohingltd.com/userfiles/goruxeworitizi.pdf
    • https://jensbrode.de/files/file/38199923483.pdf
    • http://machinesupplier.cn/data/product/file/2021913_211617_754.pdf
    • http://osteriadelcampanile.com/userfiles/files/wefopepapujado.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/12619590594.pdf
    • https://songhongresort.com/img/files/jisarorevevufogixufaf.pdf
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/vanirukavukikidirazivowo.pdf
    • http://shortguycentral.com/ck_uploads/files/39003397928.pdf
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/redikajorezopixatujir.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/q8lrj320nn35ns020ot3pn1bmm/30944699091.pdf
    • https://bacninhonline.com/webroot/img/files/94395756353.pdf
    • http://walosports.cl/userfiles/file/madefunuliwumuzevuwuwu.pdf
    • http://kiko168.com/UploadFile/file/20210907195837046.pdf
    • http://thongthien.vn/upload/files/jolafemuteluris.pdf
    • 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_off0000e63c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 16792 bytes
font_01_sfnt_off0000fe53.bin
30334bbe8e3813b9aaef7747ad9c2141b3aa3dd7f07a0a304e2ee65aba13c386		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 10876 bytes
font_02_sfnt_off00011788.bin
427de68d6ae71be2cd024fe216366cbe773a1b8d8f543077cab2bec28f79dbcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 18312 bytes

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