Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3b8d28e2ecdcf6…

MALICIOUS

PDF

72.5 KB Created: 2021-03-17 22:18:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5b1fc52184983a3a1fd92e0ce91fff3b SHA-1: 56507891fdec4e5649ace6d8d2774e994bf6479d SHA-256: 6a3b8d28e2ecdcf6f5110a42a5d20c20f29eb41124abfee1b93563a9ed0c91ea
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 0.9956

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://jottigo.ru/123?utm_term=akhiya+far+far+farkata+video+song PDF link annotation
    • http://bexukavinawexov.mygamesonline.org/balzac_and_the_little_chinese_seamstress_full_book.pdfIn PDF document text
    • http://crystal-light33.ru/22342887845490vx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454436/normal_5fe0210e58288.pdfIn PDF document text
    • http://zixaxagewan.mypressonline.com/49797262007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376599/normal_5ffdb4bbc06f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_601bacb1b9de3.pdfIn PDF document text
    • http://giocodigital.space/does_home_depot_donate_to_nonprofitsbir48.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/wewetunawej.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/falokok9a4c7.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/jubotopumujulobas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_600a710c225f8.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/duwiwijiloto.pdfIn PDF document text
    • http://pushbiz.fun/99802694712y47fj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_60041178847ae.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/53185038836.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/84448579167.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_2fd0411b3b2740799456c4063cbc06f0.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_6d6ea6baf0ab4e0b844b28a229a2e632.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_b78492988af442bdbba59fc102b7909d.pdf?index=trueIn PDF document text
    • http://pezamax.myartsonline.com/tarukoxirujofepi.pdfIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_565329d887db404fae123c24ef919b84.pdf?index=trueIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_19621eef6db149ca8dfed4e5580b276c.pdf?index=trueIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_c70783428109465e9ca26d52bc3e56ed.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_ea0e0e6ac6a14826b066fd512034093a.pdf?index=trueIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_c8c83c64c2a24fe9a14f4b6bf210401b.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_ec6034f2fed342ef99760bdc95be0e17.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_60f0c429ac78416e8cafea95907a21e0.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_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 5352 bytes
SHA-256: b93ab0acc85c975144832534ac077922b01a9a0f2d8bf9b4ea703afb157da894
font_01_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 10932 bytes
SHA-256: d2f932a259cbb136f8b49e1d3ef80e525d90a859fddf0c2120bc5d654d85d65f