Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6d6c73f5e7aebd…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 16:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 761ddfd58819944840ce90f02d600a61 SHA-1: 9e9d58ab40cca36306fb5cf28789df1780354661 SHA-256: 1c6d6c73f5e7aebdcb1dc1f62c87e950c20aedddcffdf46d3e3af5928a41f04c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to distribute links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://coretry.ru/uplcv?utm_term=skam+italia+season+3+episode+6+english+subtitles PDF link annotation
    • https://seger.cz/userfiles/file/17417593091.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/dosusodunur.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/welazijaxakakolekujid.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb0bc72b3---63541835367.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/32258762596.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/42955676118.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/63560070141.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/mejinajonikoli.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/janibafibagizelat.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/81673566030.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/99536904646.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/42026490123.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/tivugijefegego.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/54921023930.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/58547163361.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/tesasapetaziva.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/99843807400.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/likajejojuruwo.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210913230058129855.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b5607e9b93e023b223982e6b9c42feef/24131146356.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/64209177893.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_off0000ac7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7F 16368 bytes
SHA-256: 704060d13aecccd78f23e0435327f254b517ec25eb7b068128704eba20437496
font_01_sfnt_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 11484 bytes
SHA-256: a34466052ff0cf37ab74fc5ab78aa2e6ac09025321475f027b58987fe93acae4
font_02_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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