Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f031a5868ef66d…

MALICIOUS

PDF

88.7 KB Created: 2021-03-26 13:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b6736742597108710281e84fdb107344 SHA-1: 117f0afc8321c823cd4291a596d43c3064342dbe SHA-256: c1f031a5868ef66d3adcd2ac89d68dc1a4a18850fc333605e67c19b15c130a27
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/123?utm_term=carl+jung+liber+novus+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408981/normal_60236b03a36f1.pdfIn PDF document text
    • https://fepafevadaxajaw.weebly.com/uploads/1/3/4/0/134095897/541dd976.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/Hifxmgd/free_downloadable_monthly_calendar_templates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_6018c354410d3.pdfIn PDF document text
    • https://junetowumudi.weebly.com/uploads/1/3/4/5/134506976/8203074.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/gihgIjc/free_word_search_games_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/jfiZ5ij/pro_pinball_the_web.pdfIn PDF document text
    • http://xobezised.iblogger.org/brilliance_china_automotive_holdings_limited_annual_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_602a0d6023054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445340/normal_5fe51652a7c72.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/gKhjhhM/pajoxadedivit.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/mjigePy/cute_monster_battle_arena.pdfIn PDF document text
    • http://fowevuwakit.22web.org/kwikset_premis_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_6047bdc933337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/echocardiography_report_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01de16b7-b4cb-4e78-87fa-c3cf3389d33c/77591256540.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/28757554563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b25f5f-1203-47b6-b4e7-32e267cbf38b/50659996450.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/demography_and_population_studies.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/aligarh_muslim_university_online_form_date.pdfIn PDF document text
    • http://piwunutid.epizy.com/renewable_energy_sources_filetype.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
    • 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_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 5392 bytes
SHA-256: f663932e1ca77aa10948fc9e0007a7fce84d60343b1c44ca9c77bdad46daa46e
font_01_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 11112 bytes
SHA-256: cefd63df9e8ebe61143209931a3ee187d5c70294c435a770c069e149cb677d86
font_02_sfnt_off00014078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14078 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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