Malicious PDF — malware analysis report

Static analysis result for SHA-256 2556ca1d5d7f65e4…

MALICIOUS

PDF

87.5 KB Created: 2021-09-18 18:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3afecb1f18bab153894872e5311bfe00 SHA-1: 317218ed01d77dd12449aa02500624f5fb7470bc SHA-256: 2556ca1d5d7f65e4e61e64257ffde331eff41d4c185f97dfa9daf558ce3b7e37
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, many of which are designed to appear as download portals. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://schokofontaenen.de/idata/tekonagobulemisefaku.pdf In PDF document text
    • http://mardeestilos.es/fotos/file/59858869069.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210908164606_538095808.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/gigofozatalerurulafox.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/15094867072.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/92926296910.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/liwasoxibemubibadejerot.pdfIn PDF document text
    • https://limsurdua.com/contents/files/67535492843.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/49d1c4b1dabff32a337e822c69b80f0d/legavumufexenenesos.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/76316933535.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/weninuzemuxejevesizuxet.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/ralaz.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/bemedunonivukulaven.pdfIn PDF document text
    • https://mcsfood.com/images/file/60556532140.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/gibibe.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/xibajisigoxuroki.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e4fa50ab---fisigoli.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/75025251141.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/geposijajetotujizisu.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/dupalowetuwewuvimisas.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/60662993039.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/87288133180.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/5682794756.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/50920996811.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/purudab.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/57549495955.pdfIn PDF document text
    • https://eklyps.net/images/file/sexowenejizojuravika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+x+browser+apkPDF 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_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 19164 bytes
SHA-256: bf7ae9c88dce6f694ee84ffd8da51a5e67b66a69581a4e878bb668b417bef6b7
font_02_sfnt_off00013817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 10616 bytes
SHA-256: c903aa1a97fa821590e71775828d06c1249c98f4b29d026b4a5dec9286e003b6