Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c80c825761c804…

MALICIOUS

PDF

77.5 KB Created: 2021-09-26 12:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ff12988b8274917b7005e653aa26f09e SHA-1: f61e6a47a0070b8a626118c787c6962ad8a5347f SHA-256: c0c80c825761c8049495dcfabc0acc92ca06ad7acec294cad4e382283205577e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=flutter+sdk+is+not+found+in+the+specified+location+intellij PDF link annotation
    • https://ntiverification.com/userfiles/file/64963288204.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/rukuluvobem.pdfIn PDF document text
    • http://speckrepej.com/upload/file/84350393889.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/senafuwe.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/juwigonume.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161317816e02a6---61155375410.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/53493964974.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/pebim.pdfIn PDF document text
    • http://pasted-radio.de/web/files/54690044281.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/1075616446.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/ronovixu.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/kegoxa.pdfIn PDF document text
    • https://longhoang.vn/upload/files/34784223146.pdfIn PDF document text
    • https://architektor.ru/uploads/file/sofafogevedobazidijexure.pdfIn PDF document text
    • https://cope.lk/assets/media/file/39712280632.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/39869702848.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/dujuluroruxajunaweret.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210914141029.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2aa2ca97c---xaduja.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/40153518683.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/27438865975.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/54918923843.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_off0000ba39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA39 22908 bytes
SHA-256: 6aa97d0251e0b5c7cde81863acf2d7644b3d9c44735d9f001ebd9b38e2965e93
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 11016 bytes
SHA-256: 6ee329b575a7f25bb333dceaed5cca4477ffd07edee10aadc29e9f6d0948fc98
font_02_sfnt_off00010dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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