Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2738f3088deb37…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 21:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4881dda69bf956bf3096b945f50fd281 SHA-1: 2ed7a2be9d072d5197d4a8901dbab8fa3cae0b32 SHA-256: ed2738f3088deb37bdf123883b4f47e42fb9da4daee34c622624669d794cc690
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a link farm or distribution mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious content across many domains. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/gepepesepunob.pdf In PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/tofobisofipojalapir.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/7966886233.pdfIn PDF document text
    • https://ms2oke.com/contents/files/mubusesigogawanaf.pdfIn PDF document text
    • https://ptogel2.com/contents/files/mawozimoluxegakanoduda.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/58862775997.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/43827815660.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aebe8ba78---muvumuzutig.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/bidabosejaled.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/vezetutifiji.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091105094373499.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/97258980329.pdfIn PDF document text
    • http://ifap.it/images/file/novogedorisesed.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/fesegabidofux.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe40d234bb---68854693919.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/sapizutasijetefakev.pdfIn PDF document text
    • http://wohntraumgmbh.at/vegevux.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/zosegetojixigum.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/73181785551.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/47531709556.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/869993592.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/pifozepugojijeborabenixub.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/naronakajepivoguzogor.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/gejerorawaxelevalonokofof.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/43404960293.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/86300170785.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/givajiritozarevunewasino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=why+my+phone+storage+is+getting+fullPDF 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_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 11012 bytes
SHA-256: af410b49a133ad5f2332b362c8711e8ca3d5337f43a352cda2a4122c5ba43fe2
font_01_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 16828 bytes
SHA-256: e527ed82eb995100bab547870323ab3daf73f062350ea2f2eadc74f79ae50aa1