Malicious PDF — malware analysis report

Static analysis result for SHA-256 654da2b71c7b7e97…

MALICIOUS

PDF

78.8 KB Created: 2021-04-15 04:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cba5294b8ab5f4ced1d87e423ba37d72 SHA-1: 94e60b6abfad69e807834b911eb803a4911064fe SHA-256: 654da2b71c7b7e97ed250eebe95fd4fed13463cecc6c18f791970247e4023c79
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://jottigo.ru/strik?utm_term=every+heart+a+doorway+kade PDF link annotation
    • https://cdn.sqhk.co/velujuvaxal/giJjbje/stick_war_legacy_game_download_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_606ac1d62f465.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/ahihgjb/8160128013.pdfIn PDF document text
    • http://pazobano.iblogger.org/72474764576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_6041e778ce2c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367903/normal_5ff2bae0d9d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_60464c62ba494.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/gieuhgm/pejafufusiw.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/z0JnggF/marshall_mars_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_6063757f79aef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_6041fd0844210.pdfIn PDF document text
    • http://xasujaru.22web.org/adobe_photoshop_elements_2018_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/mewidexe/RWD16qm/game_maker_s_toolkit_mark_brown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_603596e694762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokipuzovorije.epizy.com/38707028631.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_39d15ad17c984ec083e255aa6b8d5908.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_0898314d56134b9cbb79bc452b21b5cc.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_ba0415864e9f4ee789c83b54777119b3.pdf?index=trueIn PDF document text
    • http://kuxomexepus.epizy.com/vs_code_python_black_formatter.pdfIn PDF document text
    • http://lovekegikowuf.rf.gd/xokexe.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_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 4980 bytes
SHA-256: 650f39b30fb4e15e8b428fad3bcbcc635332dd750630a96927f3db13cec31774
font_01_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 10916 bytes
SHA-256: 9b7efb4005163c6a9a5c5b413b6d862b284b2d1c830204b915c3fa7e3bcdf653

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