Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e84c655c18d4fa…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 09:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6f3e332a7cc92ec718833990d57d7b6a SHA-1: 4fd6ab678a8a6d0dde46d52c0a3181bbe6b92362 SHA-256: c1e84c655c18d4fa73c954db87efe3d938a2ac343e77d9ac8b60efafe1e6f4b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. 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 numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://queure.ru/uplcv?utm_term=jurassic+world+ios+cheats PDF link annotation
    • https://krantiservice.com/ckfinder/userfiles/files/94282349354.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/pepebifap.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/82918652985.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/95062390784.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/47637813555.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/pufepi.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/41247452489.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/lanorukepitavopad.pdfIn PDF document text
    • https://flomogroup.com/upload/files/menelomu.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/madovozorize.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/fewes.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161336f84618b9---44052216827.pdfIn PDF document text
    • http://cartopack.be/Images/file/bunutamibusilurazetibo.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/tetatukopofiveji.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/89568593924.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/xagokukezujot.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/lamabov.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/69472341407.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906043831.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/34457606764.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/1305333076.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/74063696090.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/tusinutajupapiwuwowenemiw.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/dezis.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/17387433958.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_off0000b75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75E 16048 bytes
SHA-256: 223e0c2c185cd8a286412cbf093cce2f83ebcc85e421fe6816758b3160581c33
font_01_sfnt_off0000e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05F 10540 bytes
SHA-256: 4870c3f4964274aa8d84a42dae8c1e7e121736b0ef6eb55e3b7f1cf469ee9591
font_02_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1