Malicious PDF — malware analysis report

Static analysis result for SHA-256 0873f7fad0d1f363…

MALICIOUS

PDF

73.9 KB Created: 2021-02-12 19:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1c72e8e01346e2a4a4adef36e7862b3a SHA-1: ac1b76939ebe5494b441236e1d18438bff3fb205 SHA-256: 0873f7fad0d1f36393afe171a30c59f3102db0de6a9616c6a95deb668b871888
226 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown-reputation URLs strongly indicate a phishing or scam attempt. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=william+beaumont+army+medical+center+jobs PDF link annotation
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/togokime-zaxevo-zalew.pdfIn PDF document text
    • https://cdn.sqhk.co/luzeginu/jcMDA9l/neon_blaster_2_cheat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_600a77b6d33f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452846/normal_6008b2f6dbcee.pdfIn macro / runtime command snippet
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/besufo_rodizirovix_depejivatolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5fdc018b05a1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_60262a48c1209.pdfIn PDF document text
    • https://wedikeme.weebly.com/uploads/1/3/1/6/131606111/zapajage.pdfIn PDF document text
    • https://bugabomusajo.weebly.com/uploads/1/3/4/5/134509224/ad0ede.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/ricjcTY/crossfire_car_convertible.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/bihuLif/41115389819.pdfIn PDF document text
    • http://steblin.pro/44679996489mc4jn.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/i3ihAjh/75022568236.pdfIn PDF document text
    • https://cdn-cms.f-static.netIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 5416 bytes
SHA-256: 7f04a9ae0fa8fa0ee7cd8da99544a28c775a0e31b236f6eba95510722d79654a
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 10504 bytes
SHA-256: 5e0406814920f95ba3d0e57b57fc72d76f7c99de2f91303d5261a0b24ac9669e

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