Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fa4be78f72a2a3…

MALICIOUS

PDF

78.3 KB Created: 2021-03-04 22:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a625cd1a80624834d5118f4492151f9f SHA-1: bd1b3a2dbcff6e9e6502fdaba719c3065a3deeb4 SHA-256: a4fa4be78f72a2a37432778cffc6a2f22057be1979bb7dc5aab59281d5e1514d
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed to redirect users to potentially malicious websites. The presence of numerous external URIs, including those on disposable hosting and with UTM parameters, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://midufefew.ru/123?utm_term=how+to+use+sharper+image+drone+dx-4 PDF link annotation
    • http://dayzcommunity.info/45597590481nx9hh.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/gojete-wifapazaredili-besoxifulorap-sajokavevijojux.pdfIn PDF document text
    • https://numezuledidi.weebly.com/uploads/1/3/4/0/134096646/d4ec1e.pdfIn PDF document text
    • http://hotloveme.online/how_to_reset_2012_jeep_grand_cherokee_radiorkpbe.pdfIn PDF document text
    • http://kushtanash.ru/how_to_use_an_oil_filled_heater9ib2f.pdfIn PDF document text
    • http://dompodklyuch.com/game_textures_freee4355.pdfIn PDF document text
    • http://xitnet.fun/contemplate_over_in_a_sentencevyv0l.pdfIn PDF document text
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/gamopov.pdfIn PDF document text
    • http://indital.space/roxupetuxaix2.pdfIn PDF document text
    • http://organic-ita.space/samsung_s30_release_datekzqn2.pdfIn PDF document text
    • https://wezinifagewugi.weebly.com/uploads/1/3/2/8/132815004/jalikelurep.pdfIn PDF document text
    • https://kusopekazebap.weebly.com/uploads/1/3/1/3/131398241/kimuliki_novugami_dorawoxubo_sutilibaxuk.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/dbfaa2f99c.pdfIn PDF document text
    • http://helpcenter.business/53919676742foh79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_7575404349094eae86530ccbde1fa2ae.pdf?index=trueIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_bb6015027ad7446cb1cdca60afcad50f.pdf?index=trueIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_6801a8a2403f401d877f332d3cd05fb6.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_17abb8264d58442fa29f9d90f81794ac.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_500acbe884ed4ee4a7e2cc39dd228033.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_aad9ac60d7744b7aa48580f9288f40e7.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_44c989ac61dd4732a92d30b8893ee427.pdf?index=trueIn 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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 5584 bytes
SHA-256: 82b1b8d2466e202f4f5cd6ccec8f36be0829962191796a8669ccd8c9d7390879
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 10776 bytes
SHA-256: 4c5d57fb6879885f52786fb620322ad02f16c4f8aa4a4ee204f5fc6b229d4602