Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7643b81651cd20…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 12:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71dcc8815552f4a16995608dcb808708 SHA-1: 085ab39f2705501ab911ff49a9e436f97d93728a SHA-256: 6f7643b81651cd20d0e95b929e4db259929e88e3343f8cbf1570a6b91afcc996
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and a heuristic indicating a 'non-clustered link farm on disposable hosting' strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious intent, likely involving the redirection of users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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 https://queure.ru/uplcv?utm_term=conversations+with+god+book+1+pdf+download PDF link annotation
    • http://soyaksiesta3.com/userfiles/file/48407643604.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/lavakelokidakimokiw.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091616000773499.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/rogakug.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/gezijonogugoxujixol.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/jugofiwujepefese.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/julufunuxomeletix.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614095726a2ab---zijunaramemibafutijasafo.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/35014405604.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/ferexefimulejemovebu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf10c4149---6207700911.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/kivusanidipebixunoziluwul.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/9907727639.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/laxazeruzunukusobepopi.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/21747012819.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/96834376035.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/56234978709.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/wotaninidevadotet.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/kifiw.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/wavigez.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/zebemukadenugikoxa.pdfIn PDF document text
    • https://primer-spb.ru/files/files/vuwenekoparadinovelom.pdfIn PDF document text
    • http://dobre-akce.cz/media/files/file/96001359874.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_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 11244 bytes
SHA-256: bebfd7515d2e450111b9aad5aa959171e9d5a480e64d5d726b85d23a757c9d80
font_02_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 17164 bytes
SHA-256: a5c275b68eeeed36058c8ed3708611013aa039bb72519d7ed295c0d531b399fb