Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1187bdd0c9b0097…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 23:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ba2e5f049974b420ffb2f8d978aa610 SHA-1: 24f5663a60f5db8404223500a5c163da7b17af17 SHA-256: c1187bdd0c9b00977e4dfc69eaa77fe40744fdd0153eba5ede282ab729aada19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links to potentially malicious or phishing sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or redirection attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://spartaksedlec.cz/spartaksedlec/userfiles/file/14256121371.pdf In PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/bebifotuguperudinu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/24513944104.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210912172332.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/sazagatamisifudeko.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/molepomekunebujazivotoj.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/crafuk2n7f7q0m8vlvva11rtp9/kediwadivozovojarokip.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/25254802177.pdfIn PDF document text
    • http://15881588.com/ckupload/files/pizosaxegutizatevoz.pdfIn PDF document text
    • https://servicepapik.ro/files/38046608432.pdfIn PDF document text
    • http://word.mn/uploads/assets/89904412993.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/waretixiw.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/kazizupu.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/14292713084.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/43051571221.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/sepixonug.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/83569526577.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/9912549769.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/14784232751.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/fuganapuwo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/wazirejaro.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/zujugip.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/68294609247.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/87052406677.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614163c7c67db---11730335165.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/95237290876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kuyhaa+android+19PDF 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_off0000b0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E7 10328 bytes
SHA-256: 69b1014a4dc7a52f32646d4647ffc4f0f6b29e4b713cf0c506a8e5dfb3da0173
font_01_sfnt_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 15204 bytes
SHA-256: b73342b9ebb8ee93fe8587a2b7b48496183e19c47d0fa7fae8c730d17402ee64