Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e862fb23c18777…

MALICIOUS

PDF

85.8 KB Created: 2021-03-16 23:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 043d40e5ee0c7fe53af1102af4f27a63 SHA-1: 21d49630b590c5e013c20ce8f3dd8674738f25ef SHA-256: b0e862fb23c18777a8059b68f2cc4b386b2a0c8b647779aebf426eb7b6f39a9b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the document's structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=the+stash+plan+espa%25C3%25B1ol+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4389107/normal_5febc4dc25a1f.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/6gdvdih/electronic_dance_music_female_artists.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_600e126129ed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489056/normal_5fd11a495823c.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/gcShaXI/business_insider_30_stocks_to_buy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_5fe9a97a3c9dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_603012c524e79.pdfIn PDF document text
    • https://cdn.sqhk.co/saxezekobida/Thethav/shooter_master_3d_free_shooting_games_download.pdfIn PDF document text
    • https://mitumusifunezu.weebly.com/uploads/1/3/5/3/135316179/1180515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416654/normal_602e220a3ad40.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/aibdjiE/34317435459.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/migumev-tikinonese.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/ij3ghcO/36474167224.pdfIn PDF document text
    • http://tiktokfrance.fun/merchant_of_venice_with_translationudrbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_600bfd5891faf.pdfIn PDF document text
    • http://hermidkovo.info/gujusufifebogiwng4dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_0a9c8b60c5634fb5ae22276eecbf441e.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_7178edf52a0143778bb8e4a4893305b0.pdf?index=trueIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_8b81c313effd4b0e9016d7f2f80cee0a.pdf?index=trueIn 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_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 5196 bytes
SHA-256: 5562958b52cacc5070c00e850a561ed053b2b7cf1bc659832f6aa2622d534273
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 12528 bytes
SHA-256: c8bb4488b1e9d012fdbd2194e3a0f7f6f37e5f4153e805f3d2f58d6f6248ecd6
font_02_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61