Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a25cd0d562d2a22…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 23:36:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 558240550b388a15bf9b1e795a1f089b SHA-1: e9ca71575e913a8cb245267f501c7458e45389a9 SHA-256: 5a25cd0d562d2a2248bceccd315f406b3938f6b6efea4234cdcb7312b0897de0
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a T1566.001 (Spearphishing Attachment) attack pattern, likely designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=crusoe+had+it+easy+paradise+route PDF link annotation
    • http://peteferix.mypressonline.com/casca_bluetooth_plantronics_explorer_500_black.pdfIn PDF document text
    • https://bolubevegu.weebly.com/uploads/1/3/1/4/131454373/dataw.pdfIn PDF document text
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/e15308dbe0e.pdfIn PDF document text
    • https://sojenumodab.weebly.com/uploads/1/3/5/2/135296615/579b5958efee969.pdfIn PDF document text
    • https://juwexulomo.weebly.com/uploads/1/3/4/3/134385858/forufalefu.pdfIn PDF document text
    • https://kaxudafesin.weebly.com/uploads/1/3/4/3/134355678/4723022.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_1adf8e4143444a0293745e14a99a4f84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/42269979760.pdfIn PDF document text
    • http://najukelosuned.myartsonline.com/physical_science_module_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1b05a4-8d2b-4b1a-9e16-db3d6c040027/jonufikuzosuvibadexedabit.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/2face_song_fire_burning.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_3698008796b340908648a3b3b97f5ea0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91a8c3b5-b13b-4635-a4ee-63a9d2556da2/resea_el_arte_de_la_seduccion.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/78635821008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f22131-0a1a-4247-b5b3-d590f1803d77/intermec_pm43_driver.pdfIn PDF document text
    • https://0f801bcd-45a9-4b76-a81e-d79ec8717d92.filesusr.com/ugd/b0b521_1ac722c3af0a45e7a3ed794813abc9b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/xememufefelexoletasubesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1224525e-e00d-416e-ae51-8c28c12ac122/army_erb_delay_separation_reason_codes.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_a7eb3eb5aca34ce8810e04aabf1e1416.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbde1f3-089a-4c64-ae67-0e2c197e5cda/34918606687.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/fitozobun.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 5024 bytes
SHA-256: 72a86c60e4a979a274726ea87b71544b5ee917fd5c7fd128f450b39b2609007f
font_01_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 11180 bytes
SHA-256: a0b27a2340930b9c7b48f4b81365518a4f321073794bd923a17f5b33398ffc12