Malicious PDF — malware analysis report

Static analysis result for SHA-256 697bb87fade88dae…

MALICIOUS

PDF

86.1 KB Created: 2021-05-21 20:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f749c13a292f954ed1fb280a5c695dcd SHA-1: 28b6960f0af95e164da20fa9f7d238867cf9c3da SHA-256: 697bb87fade88daedfd67041e929dec7b5e327a9efdaa2e9752945bdffc9fe9d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a lure related to academic writing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=from+inquiry+to+academic+writing+pdf+free
    • https://cdn-cms.f-static.net/uploads/4491946/normal_600fe4bf71343.pdf
    • https://cdn-cms.f-static.net/uploads/4469353/normal_6012c37a5ce19.pdf
    • https://cdn-cms.f-static.net/uploads/4531523/normal_601d28f59d4e5.pdf
    • https://zemejinifuv.weebly.com/uploads/1/3/4/5/134577925/aac17ae5f5a.pdf
    • https://static.s123-cdn-static.com/uploads/4451033/normal_60028a29b52ee.pdf
    • https://static.s123-cdn-static.com/uploads/4451736/normal_5fcb8f72ee0e4.pdf
    • https://kopupoko.weebly.com/uploads/1/3/4/4/134471128/tirokufuwimidajimos.pdf
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fcfa1646f61b.pdf
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5fdda4ccb7869.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1126246a-1e66-4148-9ed0-49fa000d5907/23858745605.pdf
    • https://uploads.strikinglycdn.com/files/976dd83b-3df6-4f8a-b15b-5650af1115dc/17104095863.pdf
    • https://uploads.strikinglycdn.com/files/5e124311-3f5b-40e2-965a-a788fec4d713/bajorip.pdf
    • https://uploads.strikinglycdn.com/files/a0099890-e556-40b9-a78b-b5ede05b7b23/97721385520.pdf
    • https://uploads.strikinglycdn.com/files/add5a2a6-84fc-47dd-b264-4cf66de253a6/how_do_i_report_income_change_for_food_stamps_in_pa.pdf
    • https://uploads.strikinglycdn.com/files/8fd8db4d-ffdf-4c6b-8e33-8dc6fb6e7761/jafokezemanovutiko.pdf
    • https://uploads.strikinglycdn.com/files/2b5452b7-a1cd-49f9-8c3e-839e9716f049/when_should_i_turn_off_electronic_stability_control.pdf
    • https://uploads.strikinglycdn.com/files/9dbd8100-b971-47f8-bf7b-492d8a7e9604/how_to_turn_on_viking_oven.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105c5.bin
7463276626c72881c99ec52b01520a4fae71a37047dd5086d8516af29c35dc78
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 5424 bytes
font_01_sfnt_off00011838.bin
1a3d8cbf139da0ae8ce1cdd20e67536b52663571cb4ac74fbbfcb053039b48f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 10752 bytes
font_02_sfnt_off00013cf7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF7 4324 bytes