Malicious PDF — malware analysis report

Static analysis result for SHA-256 239527ae55e70d4e…

MALICIOUS

PDF

76.3 KB Created: 2021-04-14 17:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2bd7574c3ae47de6b021257a7ad932eb SHA-1: b23899fa99ab148ea290129a17319e9db664db1e SHA-256: 239527ae55e70d4eac58b055c1d36d1857774641a441d85d57f5a3ccc132ffa9
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to distribute malicious content or phish users. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct users to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/strik?utm_term=factory+reset+shoretel+230g PDF link annotation
    • https://kesolijizik.weebly.com/uploads/1/3/4/2/134265964/827721.pdfIn PDF document text
    • https://majuxakitififez.weebly.com/uploads/1/3/0/7/130738909/zodavo-rajunuxo-gusoxazupoki.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/hgjibaj/18706761597.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/1ihajgv/block_puzzle_jewel_apk_free_download.pdfIn PDF document text
    • https://mapadubedebo.weebly.com/uploads/1/3/6/0/136095435/9e875b713050.pdfIn PDF document text
    • http://wodaserurefuw.iblogger.org/cgst_rules_latest.pdfIn PDF document text
    • http://gazzsheff.xyz/what_are_good_entry_level_it_jobs6kmcl.pdfIn PDF document text
    • http://ranking-se.com/49192871348pc9h7.pdfIn PDF document text
    • https://cdn.sqhk.co/dojikerujuwo/c4jhoCp/hernia_epigastrica_tecnica_quirurgica.pdfIn PDF document text
    • http://english-10.site/seirawan_winning_chess_tacticso516n.pdfIn PDF document text
    • http://afracheat6.xyz/391207665920b0pp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_419d9436267e403c8b14be0c839ba486.pdf?index=trueIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_53d092799e10438390c15dbc58475de7.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_c49a12e30d7e4cf6ad93cffb29259852.pdf?index=trueIn PDF document text
    • http://xemenorusameker.epizy.com/97832214755.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_ac96488b9e62497291eb238c45120a15.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_e02e54c1c3f04f619fd30920d1acdf51.pdf?index=trueIn PDF document text
    • http://nareboveridur.epizy.com/how_to_add_appendix_in_apa_format.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_a31d8b6e24eb44cc8070635cdd9219a0.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_a3c34ae17d824ab09384fe7fa569f7f6.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 5556 bytes
SHA-256: 1ce50fdb6cbcf8b6bcaca0c3a3c60ea9daaa62d66d5b0c9c4206aefcd576579c
font_01_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 10372 bytes
SHA-256: d418836ffbc95860bd3ee8642487883c8a7d6493272e66ce972b09e32070a13a