Malicious PDF — malware analysis report

Static analysis result for SHA-256 739a1cf8fa6b1528…

MALICIOUS

PDF

82.8 KB Created: 2021-03-14 17:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c6b143b95f7e7b5de6aa8859e37f6e1 SHA-1: 43f6ca10f7d3c7d94142e273f04d1a238a41a0c7 SHA-256: 739a1cf8fa6b1528cd8c8832d9b86ad9a04da14ec9143fd53dbad1ec67d56ac1
164 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which are part of a link farm designed to appear as legitimate search results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive links.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/award?keyword=detailed+design+in+software+engineering+pdf
    • http://mavogevuz.getenjoyment.net/mibeku.pdf
    • http://changely.club/6153421521049l0i.pdf
    • http://vuvulusigi.scienceontheweb.net/does_1_rep_max_build_muscle.pdf
    • http://natlab.ru/dokenixavaveta5r60r.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7e3da81a-e0d7-4a82-9b32-01d16f1b070c/tagimisizapevekafa.pdf
    • https://uploads.strikinglycdn.com/files/e544c95f-e379-412b-b5e7-7520be1350dc/hoover_elite_rewind_plus_upright_vacuum_cleaner_with_filter_made_with_hepa_media_uh71200.pdf
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_416b456b963d4d81811edd2a273ef496.pdf?index=true
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_6bd5853ea430475c984c131e2bb909aa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b76bb975-cedd-43d6-a6ba-39836dfdba2e/wimonosedewasunuliberuw.pdf
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_2f886862afe94ea89fa5cd22beabb085.pdf?index=true
    • https://uploads.strikinglycdn.com/files/accabdfc-9a1b-4fe9-a7e9-afd88b8a0513/how_to_write_epsilon_on_mac.pdf
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_7319acad55e4433ea5fe8b70c2a59206.pdf?index=true
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_35af8508165747e6ba1933eba944b5d0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ce7fed6e-5283-4430-9825-1bfbb6f29a86/94371155535.pdf
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_25f3d624d49f4b4fb39de7379bd614cd.pdf?index=true
    • 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_off00010811.bin
45ed495bd4ccfddaa27c965f74478d3ac602979bdbe014967f1ce4230892a9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 5300 bytes
font_01_sfnt_off00011a41.bin
bda67ef8918a01cdbe87c9c808cd90c71ffa8ed54eedf52aa2f7d27c4e49f06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 10648 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.