Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6e36f688e19d3c…

MALICIOUS

PDF

89.9 KB Created: 2021-05-17 19:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8163c2c7b9d73039f17ecd72353c5695 SHA-1: 2a46db651fe619a2419490534b74efc457ef0798 SHA-256: 7e6e36f688e19d3c24eb76684540c1f2cc917b25a932c9d2a011c50223d3efda
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to 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 are indicative of a phishing or malicious redirection scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=why+do+i+feel+like+something+isn%2527t+right+in+my+relationship PDF link annotation
    • http://jumufedug.22web.org/51321928048.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/6152923502.pdfIn PDF document text
    • http://wagezofon.iblogger.org/dorinozabej.pdfIn PDF document text
    • http://cmb-eco.com/laxop94gyw.pdfIn PDF document text
    • http://zedanipon.iblogger.org/59966548082.pdfIn PDF document text
    • http://msertis.xyz/wuzefilibeleximutcsgu3.pdfIn PDF document text
    • http://xonigej.mypressonline.com/assam_tet_2020_guide_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2937414f-fba0-45db-bf4b-680d1099ed2f/are_casio_tough_solar_watches_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97784ba3-af14-4052-bdfc-db214fd43496/kisozaselulugonarasobekud.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_abda7f9d5b0d47d7858f56f09a333af7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4836cb4-4068-4d2d-9180-0b3168c74000/introduction_to_statistics_in_psychology_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c325fc3a-cd8d-4509-8c95-63689f537b2c/joan_didion_santa_ana_winds_analysis.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/xirajaletifegorume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82565809-66a4-4bd6-8418-e4592157ec56/vexaxox.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_d4ab470570c1442aa9b40b906913d153.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2ed595-97e3-4d2b-b43c-545d5630c0bc/ligudutefebepofidatu.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_6c2d8859b9fe4a93ac5be034822dea10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2e5dfb-3e8e-4031-ac93-daf81703fa54/19081107168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bf706d-e284-40e4-9833-1b2e77cb7d7e/57075314642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9defe9-ad10-4bc7-88e2-4a03d92fdf68/zolowadasogadejutobujomek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337ff5fe-a576-44bd-89e7-94a5a48881f9/thoroughly_modern_millie_cast_list.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_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 5456 bytes
SHA-256: 4e2d1de40f8af50dbb678720c8ddeb7a62bcb160c2c9e9afbae3d863e781d178
font_01_sfnt_off000126f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 10688 bytes
SHA-256: f6ef57b633ed25da7f6c9e51f9a225ade675a3db81c23f04b2378ae9b18c9a8a
font_02_sfnt_off00014b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c