Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bccebfb4c155b8a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 00:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 978e7eaea45b4f1af35a9edb2eff8306 SHA-1: e8af048b5002ebc89ad9660fcf2efb46e943bd93 SHA-256: 6bccebfb4c155b8a719af273eb14f33f3e021afc84a4628749e467491c7341d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the presence of external URIs and the link farm structure strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=watch+us+2019+online+putlocker PDF link annotation
    • http://agierresrl.it/userfiles/files/66415833964.pdfIn PDF document text
    • https://ikansambel.com/contents/files/33718623068.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/rebapipiwanel.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/nurewu.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/gudusimifof.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/62316544463.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/mazevezasawuda.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb650a0828---7077652621.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/73136535734.pdfIn PDF document text
    • http://bushurov.ru/images/files/xavomusolurekanagipezi.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wibifejoduretatugix.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/lalag.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414ccd2b627---36382549857.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/6866884559.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/kejixisonisiwezurirubebo.pdfIn PDF document text
    • http://ilkemymm.com/image/files/74496751279.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/gifonerulazisujep.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/94177456466.pdfIn PDF document text
    • http://apz-arte.com/ckfinder/userfiles/files/rumugefatinovufenoza.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210901225820.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/bunujugizikovebotodimi.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/budolatumufadupevol.pdfIn PDF document text
    • https://khanikango.in/file/59833679781.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/julitukiz.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/wodoxol.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/3571044767.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_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 11116 bytes
SHA-256: f8ec8fe23144278e5c4885ac3f6521d456291945bf417215cd94f33a27403d54
font_01_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C5 18168 bytes
SHA-256: 00f36f92fe1d5f105999f59be58e23b2fc29b748c66c931a96cae624b3ad9110