Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f9e65dea435b32…

MALICIOUS

PDF

75.5 KB Created: 2021-02-14 04:16:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 86b952510a75eecd93733519351d40dd SHA-1: 1684dfb15ca73d3f3ae82728b71b8d87638864aa SHA-256: 91f9e65dea435b32744fdf836d221b36b787115ebc12b420c4bf7e441c026bfe
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://leonvi.ru/123?utm_term=citra+3ds+emulator+apk+2020', is particularly suspicious and likely serves as a lure or a redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=citra+3ds+emulator+apk+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384821/normal_6009663532577.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/NU72hiR/bumasuwupipopij.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/abGgcFO/27488260286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_600ce5d01a0a5.pdfIn PDF document text
    • http://shoop-fo.ru/rhododendron_arboreumo98y9.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/353816d9b6e6d1b.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/OONbibU/36237503608.pdfIn PDF document text
    • http://trikolor.site/4095872608m316t.pdfIn PDF document text
    • https://cdn.sqhk.co/lomokubaf/a6ggeje/9744048668.pdfIn PDF document text
    • http://arthromedshop.xyz/926666763674it0c.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/PgjiihV/powusimanorodov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_6018a47df1c63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/nse_nmf_ii_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/romutanuxodaki.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/slavery_in_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/13756021448.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 5512 bytes
SHA-256: 07ed3550032762672240f1030f90e46a41402d3ec943936575af3a44f4cc951b
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 13724 bytes
SHA-256: ba77684d59072b0ed209d5ef7e5d92b973e2f420323eedbe16e51e9b78a8f822

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