Malicious PDF — malware analysis report

Static analysis result for SHA-256 2098c26256fc6884…

MALICIOUS

PDF

83.0 KB Created: 2021-03-31 22:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b2fde0961cfacbc48189d44449524b57 SHA-1: 1362911864a6c855ad001dc6f0346d5abb4c0492 SHA-256: 2098c26256fc6884d229accf4f5ca398604d3abad91b553f56ff127acf11c975
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=the+lightning+thief+film+cast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465905/normal_601589423ab41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450724/normal_5fc8363c86d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426261/normal_60311f6c57470.pdfIn PDF document text
    • http://rimka.xyz/walokojijijupolebarotulasl5jt.pdfIn PDF document text
    • http://loveantravel.xyz/zoomer_kitty_instructionsrhfy0.pdfIn PDF document text
    • http://netzamka.ru/53764665907gobs2.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/canon_60d_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_6054b1a65fec6.pdfIn PDF document text
    • http://worodariravo.22web.org/aulularia_plauto_italiano.pdfIn PDF document text
    • http://moshon.space/schema_ampli_audio_a_transistortfkup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuxuxakoves.rf.gd/41368344068.pdfIn PDF document text
    • http://wanodabife.rf.gd/data_analysis_in_excel_2020.pdfIn PDF document text
    • http://ketunetu.rf.gd/el_libro_pablo_escobar_mi_padre.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_72474c2fc8ab4add98ead54ea78e7ca2.pdf?index=trueIn PDF document text
    • http://bewumafovalol.epizy.com/10914452329.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_f103f0785cfb4198bba8f9369756ed48.pdf?index=trueIn PDF document text
    • http://nusilemil.epizy.com/sql_server_2017_format_code.pdfIn PDF document text
    • http://zajoneforisomi.rf.gd/24543178427.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_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 5148 bytes
SHA-256: e285dfad82bc522fb90ad786574e69c88e95acfd6bf8c5ff0c5468713ca11cf2
font_01_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 11844 bytes
SHA-256: c17eea95509120b7a27489a998415273e9dd1a77d27fb49938fec7d48abd9b96