Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32b8380cb1bef33…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 07:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8fa15f902cb67beb292cf6d761c1824 SHA-1: 63373aa47006b1535f5d38bd54659965d8103d2d SHA-256: f32b8380cb1bef33fcb248f85f645e9adec65c85b315c1c5018c280668357c4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://nomylo.ru/uplcv?utm_term=free+marathi+ebook PDF link annotation
    • https://charming-dc.com/uploads/files/202109011356536150.pdfIn PDF document text
    • http://calisnt.com/uploads/files/80631083118.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/17913386781.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/jetavolefon.pdfIn PDF document text
    • http://portableandcool.com/files/files/38878063843.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/78921713283.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/wunevokedagapebew.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210902_203802.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/jadiwagaf.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///24793784130.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/somezatidixosasamosijilox.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/50219471783.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/23798444450.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zitorutewipefovugokuvek.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/51332028107.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/xedumojon.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/35761267823.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/dorelatamewobosalidu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28df58ffe---nesogexogezunupajosed.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/43327488229.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_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 10264 bytes
SHA-256: 20a419edffdf2902adba10669ce9eeb286759c9172a41f61a6164afbc1740dae
font_01_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 17176 bytes
SHA-256: 39273a9f837d813123935ebfeb5eb7bed975ac8e773eff2e1d96231df7c86df7
font_02_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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