Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bda9c91e01afd56…

MALICIOUS

PDF

78.8 KB Created: 2021-03-19 04:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ad63cd11fe4acb97b6606db0732133ed SHA-1: 23cd309a31dc9385ec8ec2442a319296ec21ba2c SHA-256: 3bda9c91e01afd568513436c182b52ae1c2d523bf67bc5f0d1c644293c5487ee
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, likely to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is designed to facilitate the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://midufefew.ru/strik?utm_term=allusion+examples+in+romeo+and+juliet+act+2+scene+2 PDF link annotation
    • https://cdn.sqhk.co/bumogebiz/j4ieuTY/lubofezotunilabav.pdfIn PDF document text
    • https://cdn.sqhk.co/bosejadukifo/XjagdHp/drama_korea_naeil_s_cantabile_sub_indo.pdfIn PDF document text
    • https://cdn.sqhk.co/kesusevuzep/hfdhbjg/32566107643.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/jejhAid/pujidajafenefuk.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/cgjic1i/40150157105.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/a216f346-4489-425e-824e-f5840fbcc87b/where_to_watch_the_invisible.pdfIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_749799f66a6e48f98f68566fdf6b7d8c.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_913e867c1fe74975bb9b13d9bf4f2a84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e388904-c13f-48ff-bbf6-827cb968a814/80146575224.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_afe165f27e004d768900072b670faf81.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_7e71c56fee624847a12bfad8868a4e96.pdf?index=trueIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_51a80f23ccb7417f9176fa14c2f3a7cb.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_6f6fcecd7092416fa345915ab6e8be11.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_6493d2527135480fa3f5b3a6610a4224.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_db8d802dba024dcb8571ba8495727465.pdf?index=trueIn PDF document text
    • https://c11ab09e-384c-4904-8c79-5ef6f38008df.filesusr.com/ugd/7131a6_9a094f2fda63420fa63a0262989c967a.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_ea408add35964c58b0069770979cdc91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/090734be-3173-4085-ba77-02342aa950cf/graco_lauren_crib_with_changing_table_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2859e85f-6f60-41a4-9c21-d4d48eedc344/vetif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff36d72-f3ea-41a3-99d4-c96c86e47506/6744561650.pdfIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_ae7b1d04b4b94b1ea2f1b5415def0e06.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_fee58962aff2495ab229292ed7b16b8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a52dc4a-c0b4-4608-b6ee-f0b27f4bf135/fenux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcada593-f57d-4198-b198-87e2a72ea66d/voravadosotimidufituzodon.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_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 5484 bytes
SHA-256: 05e0408897139a883d8443011eb2e10731ac6104f8965849d54657d781912eac
font_01_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10956 bytes
SHA-256: cecaad29c5b9c444da0a51d962526d3dd35e5fb6a875b7b60adba4698da0b504

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