Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f403db6304cef94…

MALICIOUS

PDF

71.8 KB Created: 2021-05-01 06:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6726260544945357004a1d1626bea63f SHA-1: 6cad564c9a1f0833131ec96a72c637b6027dff3a SHA-256: 5f403db6304cef9490b6b3ba64e8312fe58b4f8cb92fce3cf712981648d8dccc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=in+a+dark+dark+room+and+other+scary+stories+pdf
    • http://voxofixixaj.iblogger.org/wapewuj.pdf
    • https://cdn.sqhk.co/jojojidatun/ifqC1P4/gun_zombie_2_uptodown.pdf
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/7007024.pdf
    • http://wuvijenebomukib.iblogger.org/pafilojuwazoj.pdf
    • https://zejasuvosoropaj.weebly.com/uploads/1/3/5/3/135345482/tavodejuxalaxoj.pdf
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/nuganegot.pdf
    • http://wajujofapukalim.22web.org/tovawepuvojumorosir.pdf
    • https://cdn.sqhk.co/wolebiduju/uBQ4ujf/91023631255.pdf
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/7675448.pdf
    • https://koreluluzoma.weebly.com/uploads/1/3/5/9/135972167/6ae2eaf7da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_bcce2220c9d94e3b973d88154b60a8a9.pdf?index=true
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_219c04c154034a10af0a46c9b0065b6a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c848f4d0-6a34-49a2-bedf-c28b0a109243/fizonuz.pdf
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_2b5c835dc82541cf8eebed51c2db5229.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b28ef7a3-bb2c-4afc-9d66-0b93f167e3c2/video_del_sistema_circulatorio_del_cuerpo_humano_para_nios.pdf
    • https://uploads.strikinglycdn.com/files/41e53b17-6c1d-4290-8029-a3ed0681bf95/7338118682.pdf
    • http://ketedelinajisar.rf.gd/waterloo_sunset_chords.pdf
    • https://uploads.strikinglycdn.com/files/f83ae90e-dac9-4c89-858c-15e770db3bef/sakatofavisado.pdf
    • https://uploads.strikinglycdn.com/files/0a4e8578-f204-402e-96ec-fa5525574fa0/rizedabibulawatisap.pdf
    • https://uploads.strikinglycdn.com/files/bd9bfeeb-7da6-4254-af95-682d6601a0f6/lexus_rx_350_for_sale_by_owner_in_nj.pdf
    • https://uploads.strikinglycdn.com/files/f45c6b23-f120-40ce-a053-826be8d930c2/96447342142.pdf
    • https://uploads.strikinglycdn.com/files/4697ebb0-4071-45ad-94d9-391eba646fe2/where_to_buy_avon_skin_so_soft_lotion.pdf
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_93091e556dc54e2f944e52dae4e64650.pdf?index=true
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_a6e227d68779497e9f29b4fa1d4218ac.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_off0000da4e.bin
c5f28cae6e302014d59adcad4583102d39c7618119e63722fdf34cd4da8d6faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 5464 bytes
font_01_sfnt_off0000eccb.bin
96adef8facd511985b8073c95b09ac20d7dc7b86dc78dac40ef19de51fd85af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 10564 bytes

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