Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea39ba858db68744…

MALICIOUS

PDF

75.1 KB Created: 2021-03-27 11:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8e88ab15a96c182085c206ba07a39439 SHA-1: 118329016034149ea68788cdf703a4cac9b0fe89 SHA-256: ea39ba858db68744e45f81bc44acf401669ea491c88a8d1b3221929c6cb85b32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9956

Heuristics 5

  • 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://resalured.ru/123?utm_term=customer+aging+report+in+sap+hana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489247/normal_5fd7b0b882c0c.pdfIn PDF document text
    • http://mexuloxuxinona.iblogger.org/bcd_to_gray_code_conversion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456376/normal_604815c055712.pdfIn PDF document text
    • https://xesupolapiban.weebly.com/uploads/1/3/4/5/134586318/70d4c.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/dac3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451970/normal_604dcafc4c763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384050/normal_5fdd7f5b32945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_603727356ef77.pdfIn PDF document text
    • https://zujafewisanepo.weebly.com/uploads/1/3/4/3/134322282/tegakupudeze_datomigojebiros_posimef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365545/normal_5fe5178608fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_5fd31724be208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389581/normal_5fe3b5fe6aa2f.pdfIn PDF document text
    • https://vubufuzavedorav.weebly.com/uploads/1/3/4/7/134766784/49e39fdcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365621/normal_6005d600556cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_604cfc514d22b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_bee0489d497a47068f88ad0cb0155957.pdf?index=trueIn PDF document text
    • http://zetewesejoj.epizy.com/gubobagune.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_06d87318d5df4bc68c95e276f4b6d241.pdf?index=trueIn PDF document text
    • http://geletisabifuzo.rf.gd/44527352267.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_22ace4a359de49398426726c83cd8a81.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_83ea4cfa693647eb95e2805133dee3ea.pdf?index=trueIn PDF document text
    • http://fuguduvuduwir.epizy.com/japulutigonazupuxupobus.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_58fc94dcea40418993d14010ee66cc80.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_50672d1be3bb4760babee79a48912b9e.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_3b34b27252c94bfb96893a068fb04bf5.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_6651dc241bea49b99459676dc6ba8892.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_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 5108 bytes
SHA-256: 97b1da2b5999701b41a0b36c1bf0e725c547d8feac54e79fe6445aba52dcff48
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 10840 bytes
SHA-256: b9fc2c010dfa815ff74545eebf4193176328a7fe31db506ef936f281ce553577