Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5b513e47a4fdb5…

MALICIOUS

PDF

78.5 KB Created: 2021-04-19 18:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e03672309c1d462be6b78f6a68f0666a SHA-1: 9f0010bec5c98d6b86d6ac3005ada7e52b5f4ee8 SHA-256: bc5b513e47a4fdb53ad064bf9c90259b7fb265271a6f7577e70f0f39bd10fe2d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=how+to+do+calligraphy+on+an+ipad PDF link annotation
    • https://xunitaminovo.weebly.com/uploads/1/3/5/3/135349323/jonalixesikojobo.pdfIn PDF document text
    • http://retamos.mygamesonline.org/pdf_alternator_manual.pdfIn PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/9855486.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/8108352.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/what_can_you_do_with_a_degree_in_management_information_systems.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/hgcrVge/suvesozug.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/gievGgh/free_fire_stickers_para_whatsapp_2019.pdfIn PDF document text
    • http://mufinofol.scienceontheweb.net/zuxawufex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_ecbff22a8157408a81d035e98984d32d.pdf?index=trueIn PDF document text
    • http://pevipitoz.atwebpages.com/39295885616.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_c628e63919dc40b980eb8d685585045e.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_a0e67d85fd574da3b20449757467c9a7.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_2873ec49f3b8463082faccbfec2291a3.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_0ce73092a4dc4bcc939e7a5b59432337.pdf?index=trueIn PDF document text
    • https://b0b8c8c5-0de0-49ea-8337-0a56b8a4e65f.filesusr.com/ugd/bf9dfc_bda68de9fd9c4213bbc076e2249618b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zukogi/koxawewupubir.pdfIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_42e13ea51def4191bd1abe7daee4b0ae.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_95511839e5244dccaf8b06f80e688952.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/dexiz.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_b67d55f1cac848e9bf176de1251f9e12.pdf?index=trueIn PDF document text
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_054c868156c148548ed775e5f3c634b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jikopot/wedding_ceremony_template_free.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_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 5312 bytes
SHA-256: 280ca8f321fdcf0b8a37d968b509ab7570c55eb073d93a3d3addcddc0c5aa7ae
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 11328 bytes
SHA-256: a5e9c98f7fe38a380ded1a897ffc514e3788723ca31536598c10fc70365d1365