Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff89c078f5373df…

MALICIOUS

PDF

71.7 KB Created: 2021-05-28 21:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7794e85288b0f0fd267f4f2aa1e33cee SHA-1: 5acae2d745054b723d772d5f36f2eeaa9e85b79e SHA-256: 7ff89c078f5373df5a855ab4257e62255756e42986897dc95506532d93ec4214
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=what+does+dr+eric+berg+eat
    • https://cdn-cms.f-static.net/uploads/4424647/normal_60466e3ad4d7c.pdf
    • https://cdn-cms.f-static.net/uploads/4489732/normal_5fe8f4c736c29.pdf
    • https://xokotenesuku.weebly.com/uploads/1/3/1/4/131438709/sebuzututam.pdf
    • https://cdn-cms.f-static.net/uploads/4455659/normal_604a5ce32e234.pdf
    • https://buvujufa.weebly.com/uploads/1/3/1/3/131379824/bolobiwopudase.pdf
    • https://lonawapusar.weebly.com/uploads/1/3/0/7/130776864/xafobev_nofavobetapovu.pdf
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/bddaf37605a3c68.pdf
    • https://static.s123-cdn-static.com/uploads/4384459/normal_60062a6eb3bee.pdf
    • https://cdn-cms.f-static.net/uploads/4367921/normal_603c5187708e4.pdf
    • https://didonomomosizol.weebly.com/uploads/1/3/4/8/134892758/2c4e0da.pdf
    • https://static.s123-cdn-static.com/uploads/4416919/normal_60035d7255441.pdf
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/kireratojepomofixav.pdf
    • https://cdn-cms.f-static.net/uploads/4385647/normal_604dc996718f6.pdf
    • https://xugowumilivave.weebly.com/uploads/1/3/4/8/134846580/xutizajomiv_nadexe_vuvugenagij.pdf
    • https://wedodoto.weebly.com/uploads/1/3/5/9/135993452/d52b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4c1e20f6-c4f1-4e98-84ef-2f6617e665e9/83736422003.pdf
    • https://uploads.strikinglycdn.com/files/d530c5e2-35ef-4789-b633-a816279783d5/seganuf.pdf
    • https://uploads.strikinglycdn.com/files/9a7221bf-6f44-4459-a0c0-0a63290c55a3/fisufavatib.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbcb.bin
29fcb51791fa19d9df2f743aa1efd80504531248da04217871e255fd30ba4ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 5324 bytes
font_01_sfnt_off0000ede8.bin
ea01f6aa4a7751c23e086fbd704cdb71617431b2c008561fb7d6ee66cb6edfe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 10564 bytes

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