Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c8b7f4786bcc09…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 15:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ed8cb77d7bd5763593f239acf123876 SHA-1: d72caef53407daf54d26f05b61afb74a1b95b00c SHA-256: a1c8b7f4786bcc095840ef1cc4edc83959a34a40946d8dbbf1eacd3babc7cbf6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, potentially disposable hosts to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and the presence of numerous unknown URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thesciencenetwork.org/uploads/files/96714039629.pdf In PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/vukonuzutibuno.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/zaverido.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedc6d2332---67336196190.pdfIn PDF document text
    • http://fnathservices.com/upload/file/14143160874.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/xekigatafakerunitexej.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/taxalosikipojave.pdfIn PDF document text
    • http://iucecb.com/files/file/tezuxevodeb.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/18919992332.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/bakeromuturinuv.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906025829.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/13994399583.pdfIn PDF document text
    • https://biodez.lt/i/File/6403594412.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/sumufogapolozoza.pdfIn PDF document text
    • https://medius.sk/userfiles/file/35628466303.pdfIn PDF document text
    • https://matratva.in/userfiles/file/97446608198.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/vusepevefoxusijuzigaf.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/zilibawewuwuzosutakeloso.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/napogabunilamevozajofuzaz.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/tasaxaxixalufofadidi.pdfIn PDF document text
    • http://iltorg.ru/upload/file/59424245452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bol+radha+bol+full+movie+download+1080pPDF 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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 17692 bytes
SHA-256: 00cfd98f0dc880b8c6771c430ff0416ee910eed70f23d43c76738b684ab09668
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 11324 bytes
SHA-256: 80a85554b835af8fe66588f067817d37547e7a0695a2f84929461d8638390a8c

Open this report in the interactive analyzer, or submit your own file for analysis.