Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b088506821f4523…

MALICIOUS

PDF

66.3 KB Created: 2021-05-30 02:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 181546e3a90567605311a65871b5a0ad SHA-1: 2c9f865563af420c594b0564fb599f6137c62a18 SHA-256: 4b088506821f45232fd6454ac86bafb9c77daf7ea69f8ca2238d4210831d365b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or redirection scheme. The primary purpose appears to be distributing or linking to other potentially malicious content, rather than direct execution within the PDF itself.

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://kuzutuzo.ru/strik?utm_term=the+amazing+world+of+gumball+season+3+episode+37 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366000/normal_6062ad2bf2332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_6025987343962.pdfIn PDF document text
    • https://gilotimo.weebly.com/uploads/1/3/4/8/134899899/2989426.pdfIn PDF document text
    • https://potunajasufa.weebly.com/uploads/1/3/1/3/131381619/woxepedisezewon.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/edb2f34dc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_5fe62813add26.pdfIn PDF document text
    • https://wubaruduxosekur.weebly.com/uploads/1/3/4/4/134484821/e1ba24.pdfIn PDF document text
    • https://mumevifovamix.weebly.com/uploads/1/3/4/4/134486033/2e003262e3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409248/normal_5fff3c079704a.pdfIn PDF document text
    • https://bokorakalawu.weebly.com/uploads/1/3/4/6/134643693/70b3cdcf04c5ed.pdfIn PDF document text
    • https://wesudami.weebly.com/uploads/1/3/4/8/134881188/0d57cfeaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_603371d9e5fdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fc76ed620173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_601f6dbf56187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_602533cee69eb.pdfIn PDF document text
    • https://rakovarirol.weebly.com/uploads/1/3/4/4/134458111/mowevuvomolafefugu.pdfIn PDF document text
    • https://pomaripo.weebly.com/uploads/1/3/0/9/130969966/fedozerenojafu-jododa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_604056c66330d.pdfIn PDF document text
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/jejupinuvul-saguduloleduwu-vakoxi.pdfIn PDF document text
    • https://kagamufoxigog.weebly.com/uploads/1/3/4/0/134013308/migoten_wagapi_duwajisabotexas.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/559245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A6 5928 bytes
SHA-256: bf37da24f07e2da481f931787d046fd337b2e20c8612be9ca078f2ce4785909b
font_01_sfnt_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 10276 bytes
SHA-256: 3731a74c1a80a7fc71377d97d26e951f4648cb418a3138599af3d1240b8d8c2e