Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d71904abd25b240…

MALICIOUS

PDF

76.6 KB Created: 2021-11-13 00:38:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 702aad902d13b78170ad7c9ddd9f21ec SHA-1: 6a5ae5965ea123027b7b4c053f6cd389c288fee8 SHA-256: 5d71904abd25b24084d974e500aec4aba23b51b2659f0cb9699360fc7a0de9dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded URLs indicate it's likely used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=radiation+used+in+carbon+dating PDF link annotation
    • http://world-housing.jp/ckfinder/userfiles/files/mulurevepib.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/jedulunepafigerojebe.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20211010132201_1ogxei.pdfIn PDF document text
    • http://bienbao.net/uploads/files/vowepavaganirojekedofe.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/91023217282.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/19462035529.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1617873e4aa549---zojolavetu.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/gawobiziripamikolekabiki.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/binorebipalozojulidatadux.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/83841474956.pdfIn PDF document text
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/12302984557.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202111091434212634.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/donigunilodubu.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/8599270145.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_off0000c42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42E 18812 bytes
SHA-256: f8ddaf753ffc56d058db8f9fdf2e05f0a1d317a7d7a8f2444e762eeaa892d7b6
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 10784 bytes
SHA-256: a3c8106d68e2b9a72496890aa7b9e02e62f2540097fdd9ccc56dc86d1bec9fc3
font_02_sfnt_off00010e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

Open this report in the interactive analyzer, or submit your own file for analysis.