Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3231ff5362eadef…

MALICIOUS

PDF

71.8 KB Created: 2021-03-15 00:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 535534bc4d1517f8d248e936c6636964 SHA-1: 7251091337c2d4bc5a100e28c392ce986988b93c SHA-256: c3231ff5362eadef6f140be1756eb0fea7b2ef479146285dbdd9c6ac9486217f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=movies++2019+tamil PDF link annotation
    • http://secureappeal.com/fotulopivru9o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5ffcf47bb19e3.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/sony_icf_cs15ipn.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/zijatudanowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447436/normal_5ff0463ab7c61.pdfIn PDF document text
    • http://tozaworewinox.mywebcommunity.org/zetubozelusumafujexedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_5fcd00a358d79.pdfIn PDF document text
    • http://instapriz365.online/mujiforiruldkx6.pdfIn PDF document text
    • http://lunesygets.xyz/ejercicios_resueltos_complemento_directo_e_indirecto_2o_esoure45.pdfIn PDF document text
    • http://zoneeuro.pro/vopewoacb3q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zeteximezoxa.myartsonline.com/wawunogopewamawuz.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_de56570ca52c4ea78045f69557969b28.pdf?index=trueIn PDF document text
    • http://tofekerotireg.rf.gd/rog_aura_sync.pdfIn PDF document text
    • http://duxejuxaxeze.epizy.com/danofubipax.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_4b6db2afe00b4f778847ac04ebd61416.pdf?index=trueIn PDF document text
    • http://webifojut.epizy.com/redhat_linux_crontab_format.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/how_to_program_genie_pro_screw_drive_to_car.pdfIn PDF document text
    • http://gujomodezeroj.epizy.com/atresia_biliar.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_2a6463d3daca47a2b3f553ad34f05dea.pdf?index=trueIn PDF document text
    • http://vobuxex.epizy.com/what_income_is_considered_middle_class_in_georgia.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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 5280 bytes
SHA-256: e7bdd1a0f34cdeceefb5923adf412e0906f0e4e6b0035a1687d451385ccf5577
font_01_sfnt_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 10300 bytes
SHA-256: 9f63b2fd8839383c80f33f362aa97d96cdd98464681e754f3d8c4dfda01675f6

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