Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf4b62cc2b1ac7e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-23 04:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f65dc0cec8f0992dbbb8022f92653172 SHA-1: e9a417479a26f9f6ba5efb60d1f03c08ad0243f6 SHA-256: 5cf4b62cc2b1ac7e959f15aee36f9d9252d49da6604e8908903ee55673ba78ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mikailang.com/userfiles/file/20210903200959_1964858913.pdf In PDF document text
    • http://bulgankhangai.mn/userfiles/files/bowiziwi.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/beguwi.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/dalasofadufetexemevapuso.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/xepexakogawufewitumuforo.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/ripuroxonuxater.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/zidipavamukowunepuko.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/7304789945.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/gabukerubolugirej.pdfIn PDF document text
    • http://01host.ru/userfiles/files/52426855675.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/36503487269.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/45257834047.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/7682494797.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/65103984315.pdfIn PDF document text
    • http://salespate.com/userfiles/file/fanop.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/podivonur.pdfIn PDF document text
    • http://vhshf.de/File/97118862056.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/bowobo.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/sogemisag.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/67708629065.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210923163235679938.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/36521683935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=noun+words+that+start+with+nPDF 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_off0000d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 17520 bytes
SHA-256: 1beb1760c6e10942155eabf2370e73b15a11e7e812417dc30862774b37b4c1bb
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 10332 bytes
SHA-256: 8559455adb9ee22ea7f4258726489d5625714514098a841bb3f11b8bc16761c6
font_02_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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