Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a296022fa6d396…

MALICIOUS

PDF

87.5 KB Created: 2021-09-18 14:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e15a392118eb14db7d21ade3646b18d5 SHA-1: eacea2710acd51fb3feb0e013e232b4ff542f9fd SHA-256: a4a296022fa6d396932b16373a3bc865b06203fabb262c231140673d00d24759
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to phish for sensitive recovery secrets or private keys. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest a phishing lure, likely intended to lead the user to a malicious site. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://botosani.ro/img/uploads/file/87883232477.pdf In PDF document text
    • https://mytekas.com/UserFiles/file/98235467725.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/nedejawuwuvuzitutulozesa.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/fesixopelesobajiv.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/tepumumuvudixer.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9721110a---lavoti.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/xavefunijufojevozuta.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/44634367355.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xizojopuxelik.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/85965130996.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/90450265134.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/74722298933.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/kozojikirinubi.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/26754339108.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/47434380103.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/9385468094.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/72316312247.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/15127904009.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/10154691145.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/lavawuxisuto.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/46784429495.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/xatasurukosimabokozagud.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9779a8570---24693105678.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/somunabaxajononu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+save+a+signature+in+pdfPDF 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_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 17824 bytes
SHA-256: 67f005bc7d32b0d268b8448ce18e44f02af7da557f8e4683454ec1f402b22521
font_02_sfnt_off00013728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 10872 bytes
SHA-256: ecc3537893c841d55ec84f757c4c3d5bac17cfec27bfff594a146e6ff3dc8e27