Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b9f4288c833f46…

MALICIOUS

PDF

116.1 KB Created: 2021-04-08 22:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5c53f09d19242cf0e0aa90ebbb7ac956 SHA-1: dc9672cd480e25ed09eb6aa7c33d977fba68a251 SHA-256: 69b9f4288c833f46e50f88072f7ad2a61fcd8baf525e8249cbe9a95bf8e16495
194 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, with one pointing to 'baarspo.ru', suggesting a phishing or redirection attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, further supporting a phishing attack vector. No scripts were extracted, but the presence of embedded URLs and the link farm behavior points towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/strik?utm_term=what+is+active+and+passive+document+splitting+in+sap PDF link annotation
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/vasisikovapobo_dovuxav.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/sugiravur-kezosorumazijix-mikirupulijo-mimeruzisa.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/5f113480-6862-4253-9774-efc7d10b70dc/firajakune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c76b06c-9997-40b7-a97b-852c324e55d2/actualizar_firmware_router_d-link_dir-615.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/she_stoops_to_conquer_play_summary.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_0a235c7b3c4c4fff82a272ec2143c2a2.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_db67976dc41943adbce01119c2c898b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/zozewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c5e11a-f2bf-4dc3-9ae5-12104efa4473/juegos_de_tablas_matematicas_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c17d4af-3935-4128-8625-7f2563fec948/mercedes_e320_service_egr_valve_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac7cbfd-5e2a-4c5b-86a4-bbe64dd93cfc/diccionario_latin_castellano_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc1691c-ea81-4b25-8d2b-76bee7961dd5/fadojafexebejajonuxopixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d729dde6-0ac3-43d5-a529-aaab283cdf95/lidaxegevojik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4230fbf9-4858-4d10-814d-e9170aab42ad/nanubegun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b0f784-ca53-4c5c-9033-f22f3b886325/how_much_does_it_cost_to_use_an_inversion_table.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_f42aabbcde714967b4a229544f464b7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a561f405-0d09-49ca-88d8-193f713ed67d/lefareru.pdfIn PDF document text
    • https://359ea524-acbf-40a7-8d58-ee96a8f10bc8.filesusr.com/ugd/ca2e76_7a7e0ad5ef3946468989099c0ebff2e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopifu/97282959661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2a7d99-1f2f-4318-baae-316b7f75d15c/refupokepofinat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438466fb-c45f-4292-8000-cc606d4bfa9a/rubutonidujemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e075621-6480-40dc-9c25-81d0cf571c4a/32718591889.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_9868d7cba1dc4bbc9043925c6d4b9f43.pdf?index=trueIn 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_off000187fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187FA 5464 bytes
SHA-256: c56ff3b2ecad7d499ec86e09074d876b774b40b7216eccc430ebe9d049d19c68
font_01_sfnt_off00019a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A81 11624 bytes
SHA-256: 6790c554789e56608bd2c925f2e535fc1556cc484791f5efb488eb26a5183232

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