Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6cbb703e176b53c…

MALICIOUS

PDF

136.6 KB Created: 2021-03-14 06:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 18d9a9884407eb272857c47ee272e686 SHA-1: 0e73ca8af5060adc30e22a87048af7909ee80ce3 SHA-256: e6cbb703e176b53ce805ce255a182a0080e3f65c444b9e2efa150b7d33447b4d
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=die+unendliche+geschichte+film+wiki In PDF document text
    • http://googsnat.space/243873744625mjeh.pdfIn PDF document text
    • http://rimka.xyz/10533372375ir8e7.pdfIn PDF document text
    • http://masito.space/jikozuviwasofkoa.pdfIn PDF document text
    • https://cdn.sqhk.co/sivojadirabe/icgjA2e/57461603882.pdfIn PDF document text
    • http://adv-workshop.site/how_to_download_ti-83_calculatorf4auj.pdfIn PDF document text
    • http://realwockyc.info/fifty_shades_darker_extended_version_differences1b7rm.pdfIn PDF document text
    • http://kigurumi.org/lupasaxuvonezomozimetae0ej9.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/intel_processors_performance_ranking3eevd.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/ifgH7hf/alfa_laval_lobe_pump.pdfIn PDF document text
    • http://natur-green.fun/mathematics_for_economists_carl_p._simon_lawrence_e._blumes7uiq.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/N3Fkgdg/1225527843.pdfIn PDF document text
    • http://topcreditreport.info/mary_poppins_jr_scriptk5xet.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/fun_writing_worksheets_for_2nd_gradeewlws.pdfIn PDF document text
    • http://moscowflowers.online/pipodojagagubixalegofebieouck.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/kIghhgB/7651494768.pdfIn PDF document text
    • http://sentytld.online/dolunoegfi.pdfIn PDF document text
    • http://premiumpornclips.com/33660364024sz6di.pdfIn PDF document text
    • http://damvglaz6.xyz/viper_-_ds4vb_ds4_remote_start_system_manualxuf2a.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/gedexim/axiom_verge_secret_world_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96a8891-206f-4d62-80c3-f27de1adb1a4/81847592732.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/free_professional_reference_list_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/ruvovusutarigiwiginusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b635a0b-7eaf-4943-a5c1-e7f6734dd7bf/54188395035.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_off0001c2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2CD 5284 bytes
SHA-256: 5a7e6f7bd7c767698fe577dcd664186c532a9ba22afbebf4e15afaa73c99ad8d
font_01_sfnt_off0001d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4C4 13528 bytes
SHA-256: 94126183a393513e449ab034a9f9a766bfce55dcecda3fa746f3e7501018ccb6
font_02_sfnt_off0001ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF7E 16088 bytes
SHA-256: c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e