Malicious PDF — malware analysis report

Static analysis result for SHA-256 17076b2e3909e7b3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 04:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7c4de38953e59aed3ac438eaa207960 SHA-1: 01557c774bc875982acba43e8d3275754e58f12c SHA-256: 17076b2e3909e7b39d4f4927661e98c0856df74964f4ae79958c773da441db8f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying a link to an algorithmically-generated URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the PDF_URI heuristic suggest the document's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=dwayne+johnson+latest+movie+2021 PDF link annotation
    • http://vom-ragnaroek.de/uploads/file/wewabida.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/wiretagojixuwusatunaguruj.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/gepiledokopudorifeziguz.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/rimomowevuzinijaza.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/lusob.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/24887503030.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/sewiselolatef.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/68034277692.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/81318032859.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/teromajoj.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a2d3bf0c9---vufesiga.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/jupobirejejufe.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/80494504513.pdfIn PDF document text
    • http://bociany.sk/media/file/70090180882.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/selokuwonowapejizupufu.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/balulizi.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/91976793254.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/kegibu.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/jojugo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/e52l3vgi6528diob8hva6notfu/papene.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/985458589.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/derokapujodapipafabito.pdfIn PDF document text
    • https://cityface.cz/res/file/18755274519.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/riretuzeremib.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/4895841849.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/lafelojonaweral.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_off0000d6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 18540 bytes
SHA-256: e690f2a259e3f7f6bec6125dffba4c4d84f2b5c6d6f5edc7b4d4e35773c364df
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 10964 bytes
SHA-256: 74764ef821b366a2f9791f9ecc9d181f98fde7b1190f810fb70bf83258c8f845
font_02_sfnt_off00012091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1