Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3b672dc182f069…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 14:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5358dbcda4be3390251fbff4af87d3c9 SHA-1: 008320b172cd9077f96a6f288e53929bb3f71062 SHA-256: bc3b672dc182f069ce6d44cc23baf51fa102746456dd8596fc511504dac3bb07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is designed to host many links on disposable domains. No scripts were extracted, but the presence of external links is the primary indicator of attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=vidmate+app+update+2020 PDF link annotation
    • http://brixtontaxi.com/survey/userfiles/files/bedofuwe.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/wazovosexumugamaxatebedon.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/ripufozalisemira.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/11946894386.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/jineluwi.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/48256520152.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/1175460921.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/14031841957.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/fepuxagozatazobuzugowulux.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/beferikawivas.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/12241444811.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/forijulizagitupu.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/xexepuvatuvozekotudakof.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zawoxagiruduv.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090308075173499.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/54344807309.pdfIn PDF document text
    • http://deforma.it/userfiles/files/26521759898.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/19744190853.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/18659423512.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/37982974795.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/nalowiganezekus.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4a2ed7a1---zamaxone.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/94154186994.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/44257479926.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_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 17620 bytes
SHA-256: b3fca3aa7fd31d3d8f6b59dc6ea4e1501e84d42db75c628f0c2f40f56f25e02c
font_02_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 10324 bytes
SHA-256: 05ef03c4605ae123102a1c34cdf99077dd7d71ed89e390747c7af62299ee416e