Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d9bb1a683c4615…

MALICIOUS

PDF

67.1 KB Created: 2021-09-11 18:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cfabfbbc3c983aa192e265ac9fd322c1 SHA-1: 4eebe918cd0a5043b9967a392aacc14df60b94c3 SHA-256: f3d9bb1a683c4615a98042f1334de614bc1bfe3e8cc8218bd2dae1a4c4ae058e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a lure to redirect users to potentially malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=d%26d+backpack+sheet+pdf PDF link annotation
    • http://hyundai-baoloc.com/luutru/files/70093226312.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7fd572a3---47982407501.pdfIn PDF document text
    • https://istanajp.net/contents/files/66039086918.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/geladupudepe.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/38870974508.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/pafuzokavitajinonefikopek.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/xawutuxefufe.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/momofibup.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/fubexosinunitene.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/39151718406.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/wumatogumulabojezubebi.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/35465328521.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/sadude.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/16814821452.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/nalebadaliloboduludeladu.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/vupuratapuzubagikogum.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-10/20210910074917614342.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/jujomipifazegane.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161395e90d5ccf---ruxurebuwaminexeno.pdfIn PDF document text
    • http://atek-ent.com/upload/file/kubazononuma.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/22494354958.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/96114902585.pdfIn PDF document text
    • https://fultoys.com/userfiles/56698338132.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/bajoro.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/32945743039.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_off0000b10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 14232 bytes
SHA-256: a09137da6bce72445c69d85dd4d53b20f7bdbf758da4d651fb8b3acf59ef9bb5

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