Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec4eb11a6192b3a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-13 23:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e8faad31813d9b0c74ce856c57c61f2 SHA-1: 5d1ceab281bb8a92295f7e897a22ab7b1590ac7c SHA-256: eec4eb11a6192b3a64a85b99de49c7152331395116097883a3411e199352895c
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm with numerous external URLs, suggesting it's designed to redirect users to potentially harmful sites. The presence of 'utm_term' parameters in some URLs indicates a tracking or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://synerhu.ru/uplcv?utm_term=pubg+mobile+cheats+android+2020 PDF link annotation
    • https://khangle.vn/uploads/images/files/mosokudirozulewokelol.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/9357542826.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/nakafevovugisako.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/vofukesanojobakafoxemen.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/lonaxadimawumelowab.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xisutegedavuwaduse.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/lakoxirinupamije.pdfIn PDF document text
    • http://platcometals.com/images/file/lepul.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/37638960462.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109040234324502.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/70961306389.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/wuturesogamidukimafesosi.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/67469757244.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/vimijumizodefe.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/zupekodazututam.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/91839150120.pdfIn PDF document text
    • http://rideco.hu/upload/file/jawivo.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/86235119289.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/tutorinimetuxobobegevijeg.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/3356502713.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613934a2e1e4d---wejovamalafaxok.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134050adadd4---wapetofidizijudad.pdfIn PDF document text
    • https://petala.gr/userfiles/file/mifidaxadaxogoxopu.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/66240070583.pdfIn PDF document text
    • http://chemicalengineers.ie/images/59206007671.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_off0000c4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D4 17540 bytes
SHA-256: cf8705333f61c853dabc0a9862e9827c80d703f04605ac3a4492d1316d42c615
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 11300 bytes
SHA-256: 7ea09eca6b6bb3d5a0aa55a4af12c31aae0d6f02269627564e8b5e6fc7ed8a6a