Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37ccc17ee2e3752…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 11:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 45d9695e84dd63f829e9dbe1089a93cc SHA-1: a846e8e9d59e981b5d86f0204d8eb7e7a60fcd46 SHA-256: c37ccc17ee2e3752a798a1a9a29877a2efa94c49fdd3796505f92a6c9aafe7da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://philabc.ru/uplcv?utm_term=gta+san+andreas+psp+rom+download PDF link annotation
    • http://challendor.com/fckeditor/upload/file/widev.pdfIn PDF document text
    • https://dom-titan.rs/files/62441312399.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/safifurixarefava.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/dijepuxe.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/gowebigoveled.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/ramujinukagivexanuvavoz.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/migivijodujuferumurese.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/badinafusapozopugujodebu.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/xifanodoz.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/xezakebawutedupizem.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/15205711279.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210903050644.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/21021940260.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/dimidavavebozaranajed.pdfIn PDF document text
    • https://aneri12.eu/res/file/45148579670.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/duxajumeretimekopeva.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/kobimadexibawule.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/14844425765.pdfIn PDF document text
    • https://fuoriscena.eu/file/57634371787.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/mamixodovuwolofimisatake.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/80116149642.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/dagurepirij.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab8704c18---sileweda.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/72569132194.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/5636432620.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/nibelobukokepapo.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_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 18828 bytes
SHA-256: be9a71f5480d2908bec6e47604da113357ddf93b09d13c6747927b891ac25d08
font_01_sfnt_off000114e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 10584 bytes
SHA-256: 55d7cf50564e11794ccc853e1d0b4bc1d0428cc01bfbc2826f3630fd560b698b