Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ac2638ebbe3d53…

MALICIOUS

PDF

77.0 KB Created: 2021-03-06 08:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0186d0867a0f59b81622add1568fd1f5 SHA-1: 15b09c0a8ec4d7988f38d9590ac421e7df620280 SHA-256: 34ac2638ebbe3d53ae8740b2948d1a5446071210de146f31c8936a24a95191e1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to potentially malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://nipisod.ru/strik?utm_term=lowrey+organs+canada
    • https://static.s123-cdn-static.com/uploads/4403940/normal_5ff33f127c9db.pdf
    • https://static.s123-cdn-static.com/uploads/4468296/normal_5ffa4de4d9ce1.pdf
    • https://cdn-cms.f-static.net/uploads/4375518/normal_60372b3ec4520.pdf
    • http://xufelaketodo.getenjoyment.net/on_the_road_truck_simulator_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4367642/normal_6025cfc532330.pdf
    • https://cdn.sqhk.co/soxuvezosapa/erjb9ja/zutinorenimegataj.pdf
    • https://cdn.sqhk.co/jigavozef/8gI9NUZ/drive_for_speed_simulator_mod_apk_new_version.pdf
    • http://roxedizusugu.mywebcommunity.org/stealth_cam_g42ng_trail_camera_reviews.pdf
    • https://static.s123-cdn-static.com/uploads/4369493/normal_5fe5610a7fa06.pdf
    • https://cdn.sqhk.co/zunesunatiri/XfTNhfH/roly_poly_cannon_bloody_monsters_pack_2_editor.pdf
    • https://cdn.sqhk.co/nukusigemug/a8xijgf/91171419075.pdf
    • https://static.s123-cdn-static.com/uploads/4375080/normal_6000082747ebf.pdf
    • https://cdn-cms.f-static.net/uploads/4393632/normal_6023b98e05a52.pdf
    • https://static.s123-cdn-static.com/uploads/4388052/normal_5ff13d1195f6a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_ea7ea05d471545988bcfdccaf18e3d30.pdf?index=true
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_3d90c4e7d09e484d88c9fc8b633a8eb4.pdf?index=true
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_a9dc4ecdd6824fa39f1f60b6cb87158f.pdf?index=true
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_07f43ff807544025a9a4aae3e32d0e4e.pdf?index=true
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_46a9da016810474a806ad5c25625ca2c.pdf?index=true
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_268bcac2a9604b5b88b24c9ce16557a7.pdf?index=true
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_54da55098de34e1b9e7cd241ed12691d.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_off0000f098.bin
897fbd74305aac3d476192ec57ba320e9c5a1405e6779cae4f395881ce3be2b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 5212 bytes
font_01_sfnt_off0001027e.bin
ec486c4f3cd924e1b720cbbe099fb2f31ca43c776e029935f5c2e09de4ea6422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 11052 bytes

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