Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88f905a2b267334…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 16:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d7ff641c47c93fc114d7d96d09b4789 SHA-1: 7e16cd2f9e1cd8c5b8e6ffb7b666381ed5c5acef SHA-256: d88f905a2b26733448d13deb0796144f456546c9320da2ae0c8b455a7b878aab
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a payment redirection lure, aiming to trick users into believing there are new or changed bank instructions. The presence of numerous embedded URLs, many pointing to potentially disposable hosting, further supports a malicious intent. While no scripts were explicitly extracted, the ML classifier and heuristic firings strongly indicate a phishing and potential trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acbeeb27fe---42724750048.pdf In PDF document text
    • https://bunian-co.com/other_files/File/wavusulonabujavalone.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/bofidaradeg.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/34287780642.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/49984057837.pdfIn PDF document text
    • https://chilepools.com/contents/files/74853153616.pdfIn PDF document text
    • https://korankertas.com/contents/files/tedegun.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/riwij.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/parogokuponogaxodesivova.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd96b3459a---44565198797.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/wikavez.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/72087824761.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/20180256706.pdfIn PDF document text
    • https://zhansq.cn/upload/file/sufatunekalofosawudos.pdfIn PDF document text
    • https://5uempat.com/contents/files/12026758138.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/lediresomowi.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/musedutasogabuwudasifawo.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/87727224859.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/genelazulisakinenozumuwex.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/nugitat.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/10734158989.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/bitogokopinesodezig.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/zujatizubirib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=transfer+contacts+from+android+to+iphone+without+simPDF 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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 10988 bytes
SHA-256: eddc9937a2be602169d19be28833ea97171bc7481137d26dbcbf897dafa72dc4
font_02_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 19152 bytes
SHA-256: ad775b19f7457c24088891b86a6b9b5bfcac6d7eed24efd008c84e10326c3840