Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86849bfbc779527…

MALICIOUS

PDF

80.7 KB Created: 2021-04-09 07:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5fb62a2fdfadc10c3faee3d0cd9175ab SHA-1: 2e3e40c679401c32c53e027f795b63803e8796f7 SHA-256: b86849bfbc779527896b5235eeb37bb8dfbbb9a75ac888a0b74a0e5b04d76add
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The primary attack pattern observed is the embedding of a large number of external links, identified as a PDF link farm, with one notable link pointing to 'https://druttle.ru/strik?utm_term=shampoo+solutions+for+oily+hair'. This suggests an attempt to direct users to potentially malicious or spam-related websites, possibly for phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself is weaponized.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://druttle.ru/strik?utm_term=shampoo+solutions+for+oily+hair PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446374/normal_604a12b323375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_6062bf85edb69.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/gghflgd/53928717838.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/jhtJjhk/tegretol_davis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488592/normal_6062e229cab5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_605f5ac60a839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462059/normal_5fed604322243.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/regiwaravitovateba.pdfIn PDF document text
    • http://zabolojisag.getenjoyment.net/kapezopejedagenulibunupot.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/jarawaxanivu/boatsmart_exam_cheat_sheet_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/demutajune.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/wow_classic_elemental_shaman_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39f7a23-951d-4232-946b-b02cc6b75322/toyota_production_system_14_principles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b49863-e181-4058-9261-b3868679b685/storyboard_ideas_for_video.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/koi_aap_sa_film_ringtone_free.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_576a138bfa5d446c8b2df09f47a720d0.pdf?index=trueIn PDF document text
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_95b5e82df7ca45178d80a4590db8da51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitozi/xazidisuguvojafikutowim.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_cd50237caa614732bc30bb63899eadc3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6cd531-0ec9-4655-9047-ce50441cf1f1/que_tipo_de_gobierno_existe_en_venezuela.pdfIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_41aef529d5ba4c819dca04bd11356695.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d4515a-948b-4b29-8dc8-79f04d148e20/what_color_is_your_parachute_2019_free.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_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 5344 bytes
SHA-256: f123372de2d9d5b49ec6bebb3d87e0f9568564d9a5d64317ef45ec8f36ee9a4a
font_01_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 10956 bytes
SHA-256: 140de4b716e49c18e8aae9e23164706a41cd7b479d1942558eb01fd2a2d6751b

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