Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97b6c4d05f44151…

MALICIOUS

PDF

87.4 KB Created: 2021-09-21 09:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a062070d928e9e9e32780ff85a5e876 SHA-1: 670125c6b2045536cda6686aeda0c7286d15a0e1 SHA-256: b97b6c4d05f44151c61a26eef94d0d57259157bc91997cff98a6251ebfcfab3a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm hosted on disposable domains, designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=list+of+gta+games+for+android PDF link annotation
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/lunujapotebuxokax.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6ed2b1l9so2f39bflpivcprkm4/51455707787.pdfIn PDF document text
    • https://loyd.rs/images/file/kofazabom.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/88117845391.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/nutiwitupagelanipe.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136817b73087---bogasadakidogugi.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/xegesobaziluxuvom.pdfIn PDF document text
    • http://klhl.com/userfiles/file/famujipozal.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/87270157317.pdfPDF link annotation
    • http://sprinter-lab.ru/content/File/22487594007.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/vikesuwerawoxaxasasejuta.pdfIn PDF document text
    • http://freetds.net/userfiles/file/torumarubepakumesetijafu.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/xutusifutewefa.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/64632798107.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/kopakagozozenofa.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/sebigome.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/wolivipukiwusezo.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/fexujudusatelasuxu.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/33058339626.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/69467042880.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/63117313189.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/75911453282.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_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 10608 bytes
SHA-256: 25251614cccff0f59dfd4e5f079bbcd27bd00a0a3f39ec797fb24679cfd78420
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 18444 bytes
SHA-256: 2f244f2ebc8eb65b571c13ecdd3f53ba52b270e314f2eefe0d8f1b89aaba440d