Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b50f4aadd38e009…

MALICIOUS

PDF

84.8 KB Created: 2021-03-11 16:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93dc68c1cbac4fbe3255637d849cdc1d SHA-1: b62b797d31794151f4a7cc8ebd6b20dca33d3607 SHA-256: 5b50f4aadd38e0097bda0ea016e56cd314ec93b298419782a383cfb45fcaa759
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as manuals or technical documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

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://druttle.ru/wix?keyword=manual+olla+fagor+rapid+xpress
    • http://rubolanir.mypressonline.com/27434044462.pdf
    • https://kajavowonedefa.weebly.com/uploads/1/3/4/8/134858644/pibiju.pdf
    • http://govugododuwo.iblogger.org/how_to_reset_asus_router_rt-n14uhp.pdf
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/8e79ef67c0d9.pdf
    • http://nafarami.medianewsonline.com/vozebusipupuzalupave.pdf
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/9693758.pdf
    • http://pazadixokumox.sportsontheweb.net/new_jersey_residential_lease_agreement_with_option_to_purchase.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wazinupizut.epizy.com/66645370482.pdf
    • https://s3.amazonaws.com/wanasuvedigo/27913321729.pdf
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_c15ac66e48e643e88820b848cedf6e8a.pdf?index=true
    • https://s3.amazonaws.com/sazomo/blender_2._77_for_windows.pdf
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_d5a72c469a3a429295109d4894b14b8a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1de38f81-305b-4fe4-b4e1-fe1504cd0f4f/14406624606.pdf
    • https://uploads.strikinglycdn.com/files/01735f6c-d573-4db4-8a05-61436a72b2d4/29980268689.pdf
    • https://s3.amazonaws.com/nefomojuwet/plataforma_alumni_ucacue.pdf
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_ae07198abc074e44ab268b8969efd710.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fbee74f2-05f5-4d3f-94a8-ea62b0d50258/bumirisikawisusoz.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_off00011068.bin
bef75a64d98a00cf7a21521fc732072df8fdb02456669aef5f1d0a499f1c79b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 5280 bytes
font_01_sfnt_off00012288.bin
8283568577afbc9888232e276d3d6478302d617d31f40c0203e93cb0ec951ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12288 10572 bytes

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