Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b3c95cfc4e5e25…

MALICIOUS

PDF

89.1 KB Created: 2021-03-18 09:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e67859f21988c61a5193b2b81bd23d09 SHA-1: 71cd8bc661c668ff22d755c77c42c35ffbae55b4 SHA-256: c9b3c95cfc4e5e25d068ddd68faf3edc1d6c1b7b399287cc2f7f5debfd52f513
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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://jumiwimov.ru/123?utm_term=unity+force+crash+report
    • http://bottlechainworld.com/can_be_used_to_communicate_with_satellites_brainly3o5hd.pdf
    • http://pixell.store/56047581662hhci3.pdf
    • http://sks-expertiza.ru/rule_9a_massachusettsljv3j.pdf
    • http://topsalon.xyz/andrew_wommack_bookshop_ugandakwpnp.pdf
    • http://gamedv.design/armando_hasudungan_freeb4lc2.pdf
    • http://notdull-eng.online/the_challenger_sale_summary_by_chapternnbxw.pdf
    • http://fastgetme.online/78722815666bjaux.pdf
    • http://itrom.fun/lg_inverter_direct_drive_top_load_washer_spin_onlyxsncu.pdf
    • http://osthondroz.com/foberodekajisakuledvo09b.pdf
    • http://cozyplacefor.rest/zotokakevanezotawvccf5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_5cfd3c0c98b543278266e294e448b02a.pdf?index=true
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_4295959b9b944ae9b8763e2436e22c12.pdf?index=true
    • https://uploads.strikinglycdn.com/files/953d91e6-d458-45d5-ba0a-d7064edc51d1/fujitsu_fi-7160_driver.pdf
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_9add8b359543495e8b3f6b057fc7c6e7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f9ba2944-9a91-4bba-b535-ef473f679e07/keduz.pdf
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_905a5faed18c455c84aac06a3399099e.pdf?index=true
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_30e38ef400e9491a977fefe9c1e5138b.pdf?index=true
    • https://63a0a607-6d1b-4b95-a813-f1b07cabc719.filesusr.com/ugd/ad56f2_6b841c6224464a56a0c42df817797385.pdf?index=true
    • https://uploads.strikinglycdn.com/files/282ed8f0-c3d8-4da3-bc32-c79c567f6f95/ottlite_led_not_working.pdf
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_dc6c9daa738a4580a30ba8cc0f908afb.pdf?index=true
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_dddc8c2783254befab876ad0b536461f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/120a9752-34ea-459f-bce5-02f8a4a5f6f3/gonogu.pdf
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_db2c4be8b00c4ef8b3e5a7ece06b3923.pdf?index=true
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_d4be568000c3417d8891853ff12e292f.pdf?index=true
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_3c18e317830d428db93cfb9956948924.pdf?index=true
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_3e5461dec2ed4f3d87186978adad9d76.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_off00011c4d.bin
dceef86064beef61b7b026391e00fbfdea3ad8991bd4ab1e4a7060a3c969da3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 5164 bytes
font_01_sfnt_off00012dec.bin
e5075a7c40cf77144098406db9d08ef096036ac4d3cda1ff1d8c37a9a5e4df58
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEC 11980 bytes