Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad58f1aa7bd3253…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 14:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f079b5d45711f362277d0898b4b93aed SHA-1: 1ff92262f3fc4e0b8041e1916770cad974a514b0 SHA-256: aad58f1aa7bd3253a16a782deff0c7e5e2b95d7f9a019ed2999b5168aaa161b2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing attempt. While no scripts were explicitly extracted, the PDF format can embed JavaScript for malicious purposes, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://klimatyzacjaradom.pl/userfiles/file/fewuretipawugizuro.pdf In PDF document text
    • http://klpa.net/userData/board/file/11035601092.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/puwosivarafa.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/seguvigafulupesotari.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/63139872351.pdfIn PDF document text
    • http://nicosiacaffe.it/file/30252423753.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47c66f26c0---68724568615.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/duleju.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/josejadapopuxolo.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/33725468169.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/gemobatuzopalodewexo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wojixugisulazitelovi.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/denitugaga.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/pafuwonid.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/59701818288.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/mivurerarovogirobolige.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/jofufunowuzowimal.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/30044428905.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/79460527611.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/mumijiporopikawedanoji.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/66488902752.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/sovazuwazofimezujuxe.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/5801780827.pdfIn PDF document text
    • https://atlantidegattico.it/file/kulum.pdfIn PDF document text
    • https://citytrafik.nu/images/file/44262035930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=plano+isd+calendar+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/757f9ecad4ba8e99bc71b2259028d375/fupanebomurifajof.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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 10516 bytes
SHA-256: c1befb874c815d083df0907766be907005613e0dfce34ea8d416190007d88a8d
font_02_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 17496 bytes
SHA-256: cf21b714b95b75e02b75f6541271cd4e4d3c3e2fef62d30f508977c4c1e04226