Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b52cb699e92752…

MALICIOUS

PDF

91.2 KB Created: 2021-03-14 05:58:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 278f1dac6bccefce6d0e2a673b6ebf33 SHA-1: ed92347b4064de90033dd71232ddf574ca7b3d0a SHA-256: 45b52cb699e92752b1fc8a55a75689bdab94b2f0d8d9d587c207c8333de44902
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

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://soxebez.ru/award?keyword=deep+learning+nikhil+buduma+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403276/normal_5fcfe70ec980f.pdfIn PDF document text
    • https://cdn.sqhk.co/dirujigowag/hfPpOij/kenazogememenukowobikod.pdfIn PDF document text
    • http://kiwirixup.22web.org/dclaration_du_chiffre_d_affaires_auto_entrepreneur_maroc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416496/normal_5fe03cc1bcb0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393488/normal_60036f403f6e0.pdfIn PDF document text
    • https://fuxexuwamonem.weebly.com/uploads/1/3/5/3/135387882/kisaj_namefebigokalo_nikumemikuzinaz_nobirotagaro.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/igjlcKA/90040780619.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/12438ea397.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_e1f36fd9744a484cb440ec82be960948.pdf?index=trueIn PDF document text
    • http://dutugege.epizy.com/bluetooth_driver_windows_7_free_cnet.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_2846b9ed430343ca931c817146857a4f.pdf?index=trueIn PDF document text
    • http://bunisanabasa.epizy.com/vugupejadoxavubotijuzuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb9f1b2-680f-49be-a35f-654bebd6f31c/leccion_159_aprendiendo_un_curso_de_milagros.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_18a5223d3e734478babcdcc7815952d2.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_b86181eb4b104376a541aa79200dcfc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b1a769-96d8-4c3c-96b4-c8319a1d4999/85860279609.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_15b12a406dfa4da5924a5b23be9bf94e.pdf?index=trueIn PDF document text
    • http://zuzogit.rf.gd/next_line_in_jasper_report.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 5480 bytes
SHA-256: f05ae206545839a032e5386bf5b92c37df3aaf055cbce05924d4ae841167a4a1
font_01_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 10780 bytes
SHA-256: df1f7d8b9e3da8fe95f5b228c3b75ed48b794afc6808d7a35f452a8b3717c24b
font_02_sfnt_off000149b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B7 16164 bytes
SHA-256: 4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06