Malicious PDF — malware analysis report

Static analysis result for SHA-256 331913e0f9c3fa14…

MALICIOUS

PDF

79.8 KB Created: 2021-03-15 18:08:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ac42ab0140aa35755cb083c11fe6a3a4 SHA-1: 5483e92ff118e1e758a2e08b4fcea4d2ee694f39 SHA-256: 331913e0f9c3fa140de54bfc34aa38358a8c513455a5c8a061ce8e8c066c101f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a domain that appears to be a link farm or redirector for search terms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://botokaw.ru/wix?keyword=chemistry+notes+atomic+structure+answer+key PDF link annotation
    • http://abistrans.ru/theories_of_calculus_formationc96hb.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/revisar_gramatica_espaol_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_604eb2f4bde79.pdfIn PDF document text
    • http://tapodozinojet.mypressonline.com/bupugunot.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/taxekesitekawudewuxu.pdfIn PDF document text
    • http://persequen.com/fire_rated_rockwool_battsh15d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451752/normal_5fe48277e6519.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/how_to_control_apple_tv_3rd_gen_without_remote.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/2020_acute_ischemic_stroke_guidelines.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/zofozomamadimova5x7ce.pdfIn PDF document text
    • http://gmetry.online/nanostation_m2_unifi_firmware5biej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_601490db2a1ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_603ea11740c23.pdfIn PDF document text
    • http://dressnbuy.com/rehras_sahib_path_written_in_englishe0evh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_6789d6c228e3450382f783a53b6f103d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafee547-710d-4a77-a6d9-868ef1192466/55555041326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94edad7b-4fcd-4615-a69b-2d6ed2302a87/fovarabupaxerewa.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/arquitectura_gotica_caracteristicas.pdfIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_b2a22f20c8a948f1abce0df821235d3e.pdf?index=trueIn PDF document text
    • http://besafetusupug.atwebpages.com/tijutok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8b80d1-f1c4-4878-816e-03dbed2ba2e5/how_to_pair_skullcandy_speaker_with_iphone.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/briggs_and_stratton_450e_carburetor_adjustment.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/kugeg.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 5172 bytes
SHA-256: 4017f999cc40e085b75d8e6d8ddc10200b8d7ff091d45d36978cfe8b337ddc97
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 10920 bytes
SHA-256: 40459667c5710940c93c9ce606d917a5c4d1ac9274ac62f7b7c493052458994b