Malicious PDF — malware analysis report

Static analysis result for SHA-256 04719500c7331f18…

MALICIOUS

PDF

76.7 KB Created: 2021-04-19 00:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0cf873fa1b0a207131e3ece25b35bb31 SHA-1: 935cee8c5e48e1c78559b4eaa465f25c71920a04 SHA-256: 04719500c7331f1856d1a4f4243784c783e0393fcd37379d7e72130e5d21bb7e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with heuristics identifying it as a link farm hosted on disposable domains, suggesting a phishing or SEO scam. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/strik?utm_term=how+to+critique+rap+music+video PDF link annotation
    • http://mscredit.info/flag_football_playbook_applicationtnuqg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6047828cdb3be.pdfIn PDF document text
    • https://xugojegisonixen.weebly.com/uploads/1/3/4/6/134684264/2fa24b64db.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/6361704.pdfIn PDF document text
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/xumaz_xenibavegelo_kamuxomet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_603f1f6578a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_600db11142b70.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/valudevutezinulizo.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/peduwunuposom_podisifadat_xadilenalug.pdfIn PDF document text
    • http://chambreop.xyz/zomusexujuwodagazaci2mg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_603ab4d40ad15.pdfIn PDF document text
    • http://menbp.online/curse_of_strahd_mapsny1lh.pdfIn PDF document text
    • http://tipografiyav.moscow/bollywood_movies_2013_free_hdgio0m.pdfIn PDF document text
    • http://verification-help.com/68194889887ae6v0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7628cde5-43cc-4823-8183-530644d2c5de/mujevuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49df9e6b-2e58-444a-8ebf-08ed882798d0/garmin_drivesmart_55_lmt-d_eu_navi_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1116ef03-5087-414d-9ce4-50f3a7cedafe/95071876508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0533111-cf7b-4777-8f76-55153f85b9c3/icf_definition_av_coaching.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71949f66-50ca-4a24-9a2f-d904769c1c7c/jadokimapika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aae8d26-fb8e-4a7a-bcfc-73e99289431c/toxekenokivefab.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_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 5428 bytes
SHA-256: df2101d56e5ad111a89459d871aed228f02912053460de3e47c0d024ca45c57d
font_01_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 11536 bytes
SHA-256: ec94a13460992b5749f410089e698d1c6281b9d31139aadd1451114343bd72e5