Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69f923ec756fe31…

MALICIOUS

PDF

72.8 KB Created: 2021-09-14 10:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c91ebb933afbf5c64b91e5905134ec48 SHA-1: ca9e5de8bf1ba0a1f3624b390fc6c386c66a78bb SHA-256: a69f923ec756fe31bb41743c076851a3321e5ce814736e7028c6215eac319877
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 numerous links to external PDFs hosted on various domains, many of which appear to be part of a link farm designed to obscure the true malicious intent. The presence of multiple PDF objects with different bodies suggests obfuscation techniques were employed. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://stickerbarcode.com/file_media/file_image/file/xereliwewijul.pdf In PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/lifomizedo.pdfIn PDF document text
    • http://abwva.com/uploads/files/14875877777.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/givoniwogit.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/nutuzojananuzomukosez.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6fa201522---soviz.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/60677032202.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/af237d580eca59e1635818ef1c02ed63/luwenomupera.pdfIn PDF document text
    • http://hanifeugur.com/image/files/82389866729.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/78329503769.pdfIn PDF document text
    • https://businesslife.com/content/file/72304122244.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/33344078782.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/25634710869.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/wagoxumulebifojojuxavis.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/96778198515.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/76846826303.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/83666442110.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/rulipewemevuxasomilirike.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/49522896189.pdfIn PDF document text
    • https://ksboutlet.com/file/files/xulawepizesatubojigigi.pdfIn PDF document text
    • http://dogable.de/userfiles/file/82216795945.pdfIn PDF document text
    • http://e-district.org/userfiles/file/lutabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mv+master+best+status+maker+app+download+apkPDF 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_off0000b936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB936 16828 bytes
SHA-256: 6f1062161c22ba688f7c79b6b9a5be71fa94cd7cb817bda8eb9b697e90ba48d1
font_01_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 10936 bytes
SHA-256: 6c3665c7a1586c15f65ea54b451b8d5d4738790595f39739b45ea53aaf630c8f
font_02_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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