Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69bcebe29e807ce…

MALICIOUS

PDF

81.0 KB Created: 2021-04-25 22:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 40e5dd9bc2ef3127687d7d6c11239eeb SHA-1: 02ccc0a3d99a4689aca2de672d697d48ef8c0178 SHA-256: e69bcebe29e807ce61ae05773b295b1307e4adcef1b0cf4332c513c62f610cdd
186 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/strik?utm_term=chopin+raindrop+prelude+henle PDF link annotation
    • https://rupedotumimeto.weebly.com/uploads/1/3/1/4/131482941/nibikuro_zedoz.pdfIn PDF document text
    • http://wimebenese.getenjoyment.net/9095192953.pdfIn PDF document text
    • https://duvirimak.weebly.com/uploads/1/3/4/6/134603536/1808387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/sintomas_da_anemia_falciforme_e_tratamento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8828bbc4-f1a5-4fe8-864e-88ec117b2140/valelikivefavamukifiwopi.pdfIn PDF document text
    • http://murapimopavopa.myartsonline.com/bujinejeramal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c03de2-6778-47d9-bd0c-ff1a41c2539a/how_to_declare_your_undying_love.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_ec227d9b882341bb8853cb8923e63ac8.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_aa78fe85aefb4855a59001c9faa9cc77.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_fd042d0e19bd4fc8a7fb7634aeeb182b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d49c94-51ad-4137-93f4-65741908a5e3/gerisawagatixufajan.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/63404392883.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/gigojilosetomuletigo.pdfIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_b7ca43cb08894aa79d396de97f4560d1.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_d27145d98cf144758c8d0946d1dadd58.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_3c8140aecac246bcb18cda1763e23ea4.pdf?index=trueIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_63e744f4d954466aa29aff14bdd07273.pdf?index=trueIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_ed58c79cc7004130a29d06b70997327c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6b2fc7-d4a4-4950-a9a3-0bb3d32aeff9/minecraft_song_piano_notes_letters.pdfIn PDF document text
    • http://sefowolo.atwebpages.com/jetikurulu.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/google_chrome_apk_file_for_kindle_fire.pdfIn PDF document text
    • https://83662c7a-80c1-4e94-b5a4-3df479670d58.filesusr.com/ugd/27be29_957f1a755b57493ea445023328d248be.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 4772 bytes
SHA-256: 86215d4b438ca86c1a406befe776234de56646088693712f6d09d07f7a2c7a3f
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 12008 bytes
SHA-256: 893da346f772974e76751b99767e2c1d4ea6ee6134199afeadc3e7e336ccd528
font_02_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12

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