Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ee99c0e3431452…

MALICIOUS

PDF

80.9 KB Created: 2021-03-23 18:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97ae974ff944851a097a424ed2d7f34e SHA-1: c55f164ae56f492e8ee8377645dcbd70c829c54b SHA-256: 67ee99c0e3431452db31f42ff17855b9b6826122044402f86ac7a4d2f025291e
196 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://fokemale.ru/wix?keyword=density+mass+volume+worksheet+with+answers+pdf
    • https://cdn.sqhk.co/lojibuwe/jajbgi1/bimatoprost_eye_drops.pdf
    • https://cdn.sqhk.co/gabadifofibo/gcigedN/baruwujuriwagovudotupetix.pdf
    • https://cdn.sqhk.co/dadirowuj/hojZTWw/82792754785.pdf
    • https://cdn.sqhk.co/kototokim/cggjhhc/japanese_alphabet_song_hiragana.pdf
    • https://cdn.sqhk.co/disonixures/fibDid3/child_inflatable_alien_pick-_me-_up_costume.pdf
    • https://cdn.sqhk.co/gotubosif/igHcgfh/57063281323.pdf
    • https://cdn-cms.f-static.net/uploads/4372399/normal_60122412e870c.pdf
    • https://cdn.sqhk.co/bilanogakiw/cghdtr3/99948086299.pdf
    • https://cdn-cms.f-static.net/uploads/4411916/normal_600c45f586068.pdf
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5ff97cc3836f4.pdf
    • https://cdn-cms.f-static.net/uploads/4496389/normal_6029acdd111ec.pdf
    • https://cdn-cms.f-static.net/uploads/4414166/normal_600c6931d5460.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_6f25e860a25c4af09b3790051eed9c46.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_de17b1cf3c894b35b36e43f42d17f177.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1120fc32-c721-4419-bcc5-cf1ef3f9b6d4/96722042073.pdf
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_6079fa2072934008bbd4715b6e71dcce.pdf?index=true
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_a7297f6c61ff4e298e666e4660171a38.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a817f77-868e-48b2-8af5-679ec5739a92/xudotidefigirununenux.pdf
    • https://uploads.strikinglycdn.com/files/12ae8162-d590-4d28-855f-0d1262768e3d/rufudovi.pdf
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_b22fdd19c3a64923b50951afba74c80f.pdf?index=true
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_992895a415b64d93aca7a5ffed6c562c.pdf?index=true
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_2c7788a7f9894a2e86e8d51981b9add8.pdf?index=true
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_1c42aaee5d6644af8454309c9f30337a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a8.bin
f31eba13a97f2ebad0600981ea9b0deff5a06b3a483cdcb1568d17a32a0a5f10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 5596 bytes
font_01_sfnt_off00010aa3.bin
db330a1ce6eabfd79f8fa9ab6e9e55c36ce3891e256b92c13f971451fd6f069f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 13424 bytes

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