Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2311083ec79ee3…

MALICIOUS

PDF

72.7 KB Created: 2021-04-16 20:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b91acf524213054e5e9c7307bee3c637 SHA-1: bae09330f74190225f704dd26927861cff792f14 SHA-256: ce2311083ec79ee3f0442e71d54d0941c75c35ff160ea9de763f491affeb38f0
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, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=the+book+of+life+pdf+krishnamurti
    • http://vovality.club/34244260822dbw1r.pdf
    • http://pochta-24.cc/binokilenibosorafet0uz.pdf
    • http://mmeueue.space/wadirelilupogabupaxsigji.pdf
    • http://kidepokapila.22web.org/tedewobexexezagu.pdf
    • http://xiledokujajipo.22web.org/math_vocabulary.pdf
    • http://casserlabs.xyz/32895201517dag4g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajetufekejo/autocad_3d_max_free_full_version.pdf
    • http://pitodisile.epizy.com/72587382595.pdf
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_387e0dd81ce34fc083a4c75022823dc0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/80b455c1-1230-46cf-9069-cf3e8f55bf0e/13794581034.pdf
    • https://s3.amazonaws.com/tojazudibumogab/instrumentos_para_recolectar_datos_cualitativos.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_5ea4ddb2389a4fe78c50e850d7b004be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f85fbf06-9a1b-4c6e-b14b-4be364ff44f0/jamonivabapojonevor.pdf
    • http://kozitoxezafovi.rf.gd/cancelling_a_mobile_phone_contract_letter_template.pdf
    • https://uploads.strikinglycdn.com/files/0026f80e-5d6d-43bd-8c57-bec0f7e088b3/black_hawk_down_game_remake.pdf
    • https://uploads.strikinglycdn.com/files/40465f82-fb36-466c-8a07-800beedfc39d/jerozutigugasezuzadovuwo.pdf
    • http://fojoxolizono.rf.gd/asmanex_generic_form.pdf
    • https://s3.amazonaws.com/pafexegud/what_is_party_boost_on_jbl_flip_5.pdf
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_73ade5e064804a2eaae2f2db270a7792.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab4d3e83-f3fd-4d64-9eec-618f8861a133/53976107515.pdf
    • https://uploads.strikinglycdn.com/files/6383c14e-0230-49cb-8ba2-e9a8e28cce69/fapojawul.pdf
    • https://uploads.strikinglycdn.com/files/a0dd717d-3315-459b-82c2-9593167a732e/11383134888.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de5f.bin
08099478c0657a3cb7047b28dee9d3d0a584a5b7de1cadcb0bf10b8d0b92281e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 5432 bytes
font_01_sfnt_off0000f0aa.bin
c57cd252a728fd16432754b3599ed2e769d839358f6fc7286867554a4ed6fffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 10732 bytes

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