Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a251feabc341fd8…

MALICIOUS

PDF

80.6 KB Created: 2021-03-16 15:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 654f198fca64bcf576ddc9323c3a4cbf SHA-1: 25de6588d67d726a48042413e9fb65456d234399 SHA-256: 1a251feabc341fd8b02768b1d1eadd4da244c7e2d0aa7f2c0f8027155b089727
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://ponafet.ru/123?utm_term=real+estate+website+templates+wix
    • http://vknart.xyz/solar_energy_definition7p5si.pdf
    • http://pikaromabunoteb.iblogger.org/32770602163.pdf
    • http://bigmagazin.xyz/epic_7_furious_connection_guideaon0b.pdf
    • http://gosofejabe.iblogger.org/dadimatogezaxaw.pdf
    • http://tawotikuwaziwun.iblogger.org/93727000631.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_1e175034e1d746abb874df50dcc27006.pdf?index=true
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_b0344fcd7c3349e6b09df9ba61a44a3b.pdf?index=true
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_5261a5e8c7dd436c9ab09746684887d4.pdf?index=true
    • http://gekomulo.rf.gd/angola_janga_download.pdf
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_fdfbedc32c9c43d085c349ac08055aa8.pdf?index=true
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_a7750b59f9274b8695e0055db792c312.pdf?index=true
    • http://gesutebixip.epizy.com/ordering_fractions_and_decimals_from_least_to_greatest_worksheet.pdf
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_cdc9619aa0a643758819d5814efab1a2.pdf?index=true
    • http://sodidoxab.rf.gd/nibixonaligapifu.pdf
    • http://xozadopuwol.rf.gd/what_is_the_difference_between_oracle_12c_and_19c.pdf
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_24df09b794834718bdd490cc2e7bc6f7.pdf?index=true
    • http://sikejafomanama.epizy.com/takomedija.pdf
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_fad74c824ebe498c9ac048479f157a4b.pdf?index=true
    • http://zuzasuzojenox.epizy.com/32835906080.pdf
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_548e7fa0587342b680b673e3eb6e64ea.pdf?index=true
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_ee1e310884c74527916f5d31ff59eac2.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_off0000fc84.bin
69d6b48bb11bc3bedb115bc29085029030b346cfd7e166f7f7f29972f3ae1154		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 5176 bytes
font_01_sfnt_off00010e29.bin
80ab306c5b707bd693c34f0f4550660516a7360aea43defc09cb38d6d3857805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 10860 bytes

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