Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32de27048bd8d65…

MALICIOUS

PDF

75.8 KB Created: 2021-03-23 13:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 476514500fd5f10ad01a093ea5c3be46 SHA-1: 592f9fbf01f155fe190f49b8a44cbd18994be589 SHA-256: d32de27048bd8d65b0608739ebc96f841a8e56495049154632b23318d26a378a
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1553.005 Security Software Tampering

The PDF contains numerous links to external resources, many of which are on disposable hosting and appear to be part of a link farm. One prominent URL, 'https://gimoguvi.ru/strik?utm_term=adobe+illustrator+cc+2019+crack+amtlib.dll+download', suggests a lure for cracked software. The heuristic 'SE_SECURITY_BYPASS' indicates instructions to disable security software, and 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic to hide malicious payloads. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://gimoguvi.ru/strik?utm_term=adobe+illustrator+cc+2019+crack+amtlib.dll+download PDF link annotation
    • http://shoppingyxplus.xyz/xefexozibekonagizatiseweiawzy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5fd334fce2e5a.pdfIn PDF document text
    • http://ritikutoxukor.22web.org/tixatuvizubirowejiguvoz.pdfIn PDF document text
    • http://degimoto.22web.org/zama_carburetor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368493/normal_5fc9bba647cb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426423/normal_5fee80ee4237a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488092/normal_6051c742dc1b4.pdfIn PDF document text
    • http://wekeb.space/nuevo_codigo_civil_de_puerto_rico_2020_cual_es7yq9l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_603a9ba52e9df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_600f90e489089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_602fa132cf7a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505839/normal_6012d1ef8b974.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bonizeza.epizy.com/herpetiform_aphthae_definition.pdfIn PDF document text
    • http://maguzudag.epizy.com/tegixunutukize.pdfIn PDF document text
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_b8596710448c42728c36dcd58c686738.pdf?index=trueIn PDF document text
    • http://kegipufi.rf.gd/digital_electronics_basic_interview_questions_and_answers.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_ba629145c46149d7968d7ababeba6b6c.pdf?index=trueIn PDF document text
    • http://xizajitidug.rf.gd/the_riveras_season_4_episode_10.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 5768 bytes
SHA-256: f6fc58b19d46a6ca0b26fbf0e4edfb0bb8da78d5beaeeed974daeda486aefdd3
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 11484 bytes
SHA-256: ab8d57d761ac8f89b1c65a19b64201d6f5a68334e4f2e5df5afe45f5863fcb6e
font_02_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378