Malicious PDF — malware analysis report

Static analysis result for SHA-256 b560bd18376f6389…

MALICIOUS

PDF

85.6 KB Created: 2021-03-14 05:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 52f2e1c7ba4cc195b70d47531677a2c8 SHA-1: a0741ef5b74658ea72e362763c69509b515d9993 SHA-256: b560bd18376f6389fec70e39444c302ace0dd62c1f9097510752d42de5f0ce23
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points to a redirection or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/award?keyword=accidental+prime+minister+book+pdf+free PDF link annotation
    • https://jotutavujisab.weebly.com/uploads/1/3/1/1/131164129/a8d36369413.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/vuker.pdfIn PDF document text
    • http://paruxezogu.mygamesonline.org/81902813179.pdfIn PDF document text
    • https://nonewogigej.weebly.com/uploads/1/3/2/6/132681399/faxumifavagimodakop.pdfIn PDF document text
    • http://moneyindia.site/why_are_there_chinatownsrvhf0.pdfIn PDF document text
    • http://axecheat8.xyz/how_to_get_vivint_installer_codew25ad.pdfIn PDF document text
    • http://roserubusigiwij.mywebcommunity.org/ncaa_division_2_basketball_regional_rankings.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/wupanudujof.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/37287bbde56e79.pdfIn PDF document text
    • http://phillipen.online/71274130166mya00.pdfIn PDF document text
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/7629765.pdfIn PDF document text
    • http://boomerangoo.site/28822649819m0c6r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gabamad.epizy.com/sukewunelevutaxidififuvol.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_8500d879fceb4289b2b400f15222294f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f279af69-feb6-4377-b74d-2fb8ade03bf3/39041913610.pdfIn PDF document text
    • http://wimovokixopipi.rf.gd/anemia_of_inflammation_and_chronic_disease.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_df3171dfab7c4aadabed036a9b6f8b69.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_a5a8352491614f02a3271478e8d28338.pdf?index=trueIn PDF document text
    • http://giwetigimibe.epizy.com/microbiology_of_water_and_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4887d2-9ace-4bb0-bc44-9a32241e0055/99646520920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1540b4-a762-417b-80dc-a1293bc04d0c/how_to_print_all_documents_in_foxit_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6d5a56-a465-40fc-8f0b-87ac1f23d3a3/56049670156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bedc38-7ab8-4b4b-b378-6620015ee6b9/how_long_will_windows_server_2012_be_supported.pdfIn PDF document text
    • http://xukokumo.myartsonline.com/bhagavad_gita_complete_book_in_english.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 5492 bytes
SHA-256: b6671828ce325241098aa111f20c2b47bff46254ddc781bc307f48c3a48e3979
font_02_sfnt_off00012455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12455 10524 bytes
SHA-256: c2bc86da7e2f930a9d11addf7dc187519d48f3dc3bbb056110b25f5139619667

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