Malicious PDF — malware analysis report

Static analysis result for SHA-256 4168250129c7587c…

MALICIOUS

PDF

81.4 KB Created: 2021-03-22 01:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fee293af2f1b238dbe240747e20e45a8 SHA-1: 8665da83e1d9f1a526e5d4d06f350bec8608fbfb SHA-256: 4168250129c7587cac8c057a36f2f86e5c319208e8c877c3e27de0591b28ddcc
186 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a website designed to appear as a search result for anatomical information. This is a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing unwanted content.

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://botokaw.ru/award?keyword=human+anatomy+bones+and+muscles+pdf PDF link annotation
    • https://cdn.sqhk.co/xixujipum/zRibvhd/15730775188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_60280c1788642.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/vobejixuzizurasu.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/dynamic_shear_rheometer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375885/normal_5ffd4c10116aa.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/hz1hahf/25165569749.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe87ad3-218d-44d6-8ea9-71ce8333d898/husky_1800_psi_pressure_washer_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ead7ea0-cc9d-4caf-a3dd-d58af7b432a9/problemas_porcentajes_encadenados_3o_eso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb55f7c-54af-4898-b9c3-569d482c7d02/parup.pdfIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_9d2919fb41f64cf78a2ea33acf25c468.pdf?index=trueIn PDF document text
    • http://wutejaxevewef.myartsonline.com/used_snapper_riding_mower_for_sale_georgia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d916ace7-1430-46e6-8390-2e0247a884e1/dash_diet_menu_plan_phase_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f70349-9753-4339-95fb-0e2fd8404d59/how_many_1096_forms_can_i_file.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/80850726984.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_f447bdb8c83d4092a1b1f8da9808ace1.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_d25ab61dff65495381c23314dfbcb852.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/tezisarukod.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/63893574308.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_9704700a8b224c63974185bd283ff1fc.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_e640e7eb2ba54c4796097dcddccaa9d5.pdf?index=trueIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 5408 bytes
SHA-256: fc1c2009ca8cd04dd869bd317313c7b1c85476525363d6e12059e514cf183366
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 6068 bytes
SHA-256: 1f79b081fe245cf9181f2e6ad484d5de3f355e0828dbe7aa1c14a68e096e11b6
font_02_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 10276 bytes
SHA-256: bcacf9e88aaa879b4b0bd51e1c15d4a41637475da8ba3db2ffc2289b40c620d6