Malicious PDF — malware analysis report

Static analysis result for SHA-256 138418042abcbe79…

MALICIOUS

PDF

85.3 KB Created: 2021-03-15 03:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a396f73b9305689ed5a553c17790aba SHA-1: 7658ad6719fb6f0359fc088e5f68328865c73a0a SHA-256: 138418042abcbe796861264eb44ca8d57609b75ec01b7a3ff0f003eff9033300
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of 'powershell_script.pdf' in the document text suggests an attempt to disguise or facilitate the execution of malicious scripts, likely JavaScript given the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ponafet.ru/wix?keyword=gsm+desynth+guide+ffxiv
    • https://cdn-cms.f-static.net/uploads/4402711/normal_6035b3c46915a.pdf
    • https://static.s123-cdn-static.com/uploads/4368976/normal_5fee4a615cbdb.pdf
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/supizefipofajabun.pdf
    • https://cdn-cms.f-static.net/uploads/4497081/normal_6026b230e308a.pdf
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/gefopupabagapegoken.pdf
    • https://cdn-cms.f-static.net/uploads/4383792/normal_6044677ce2f33.pdf
    • https://0879403c-3be5-48e4-925f-21334a
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_8dd10037a05b4745b6d062d124c32cbe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/443c2428-cd36-4582-869f-2bcf1d984139/mulomuzukizatemozilijirid.pdf
    • https://uploads.strikinglycdn.com/files/3c5e57c1-bad0-46c2-a452-e657b902da47/windows_10_startup_folder_powershell_script.pdf
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_41984a77db824496a19537711a561122.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84ed270e-398e-464a-b2ea-669c629bf3d4/32279140296.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_d9a41b9755bc41c8b578945525eb6856.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cb147e72-fed3-47b7-9443-150d8705202e/6472895938.pdf
    • https://s3.amazonaws.com/tudawufed/bogerazefikegepina.pdf
    • https://s3.amazonaws.com/julexekubaj/gisexepuzikaxog.pdf
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_4f191149184443f988cf64a110820284.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3de7b8f1-dcda-4def-8b07-6c8a00981ec4/speed_of_trust_principles.pdf
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_df8b521f26124f5aa8dfe78bb8093223.pdf?index=true
    • https://s3.amazonaws.com/vufupu/9361138742.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_off00010d07.bin
08db6e78d54b631ed7d92bad2bd2cb8ec498225910727846ed68a86e66f40522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 5244 bytes
font_01_sfnt_off00011ed4.bin
0bbfb5a412c650667d0b24ca28c7c8eb27e56f3ccd3092b0e425bcadd79d21a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 11816 bytes

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