Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbcda4224e336f2…

MALICIOUS

PDF

75.0 KB Created: 2021-03-10 08:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0e653f40692ec1e6b9e0a0e8479b850b SHA-1: 8efa63c1778fb963ab9c89fe714f39bf8db0fc50 SHA-256: cbbcda4224e336f236f6df2848e715634ed84fc59fc4ae570b1c602b4307ea8c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, with many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it may leverage embedded JavaScript or other PDF-specific exploits to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/123?utm_term=imagery+worksheets+6th+grade PDF link annotation
    • https://ninobajoxakatud.weebly.com/uploads/1/3/4/7/134702009/6fcb919fba.pdfIn PDF document text
    • https://binilitafi.weebly.com/uploads/1/3/5/2/135295912/vexiwakosopudo-fefinof-nekajixemeg.pdfIn PDF document text
    • http://domainlimax.xyz/nesewajoxus7879s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_5fe01a8971a25.pdfIn PDF document text
    • https://rarerosedipise.weebly.com/uploads/1/3/4/8/134876587/seniginovuzite.pdfIn PDF document text
    • https://pagilosotutan.weebly.com/uploads/1/3/0/9/130970008/46726bb2ad.pdfIn PDF document text
    • http://pidawiwosoda.iblogger.org/start_jupyter_notebook_windows_command_line.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/b4db8abd.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/49892031574yeszt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5fdb091d1a19f.pdfIn PDF document text
    • https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/vunosifurajunuduroz.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/kefetiw_namubi_pugomavolozosiv.pdfIn PDF document text
    • http://zebrait.fun/how_to_get_chloroform_spray_in_pakistan5evj6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipowefata.epizy.com/72126748312.pdfIn PDF document text
    • http://wogokafen.epizy.com/asp.net_c_visual_studio_2010_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/night_shift_merch_black_dahlia.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/jafudek.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/jipexuzab.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/nerisalikunikod.pdfIn PDF document text
    • http://mezubivedoxida.epizy.com/gb_whatsapp_latest_version_december_2018.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 5556 bytes
SHA-256: 7e1935227b69647f6ff86c882d156ae96009bf0c66e11f9a1e0966ff276a3869
font_01_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 10236 bytes
SHA-256: 981ddd705ea612906e95da85976b6c63a306cb5eb3a5e80e6d78d5ab068517cf

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