Malicious PDF — malware analysis report

Static analysis result for SHA-256 a651a38547be74b0…

MALICIOUS

PDF

80.9 KB Created: 2021-03-20 14:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7897232e8f8f13a4cdb8bebb3f1a4e6d SHA-1: 47eec2cb793d3a0b8067cd6900e47521a9e6ba7b SHA-256: a651a38547be74b05910af828bbb019a80954523476cad152ae0fdcc0973d194
126 Risk Score

Malware Insights

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

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 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=monster+power+pro+3500+manual PDF link annotation
    • http://voicebftyi.com/940329712693fw82.pdfIn PDF document text
    • http://fherixq.com/the_last_sherlock_holmes_story_read_online0c4g4.pdfIn PDF document text
    • http://usacarins.com/another_brick_in_the_wall_songjaleu.pdfIn PDF document text
    • http://arm-watch1.club/13153261103q33gm.pdfIn PDF document text
    • http://aov.one/joxokorixafabuvokuc4ra.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/oxenfree_anomalies_meaninggdlp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_604d80c39e880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_600e76776d449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_5fdc168ba9986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_600aac437ee9d.pdfIn PDF document text
    • http://tryraisins.club/90018436184944em.pdfIn PDF document text
    • http://nat-yoga.space/91480595406cxqiz.pdfIn PDF document text
    • http://geesecam.com/iot_based_transformer_monitoring_systemnr3nv.pdfIn PDF document text
    • http://strgb2.ru/ganapati_stotram_telugu_mp3_songszb2mm.pdfIn PDF document text
    • http://losinglotterynumbers.com/womulibisesozozepofetedez84b80.pdfIn PDF document text
    • http://vzroslyh.net/ic-718_digital_modeswqbxh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_600cb576233a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494149/normal_5fdfd5352370d.pdfIn PDF document text
    • http://3gusevshop.space/harina_de_reposteria_en_english7ekrj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_60411b9f7d160.pdfIn PDF document text
    • http://effektzhizni.ru/derivation_of_lens_maker_formula_for_convex_lenspy36g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_5fe60a3380931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_9fa8d4ac3172426aba8f6890af3b0b59.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_d42eae2802ef40d7b83db832367b0f85.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_3f44f05e0821416a95d75cd5b34fb89f.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_12634bda420a4f01aaeb8cf3a8cc3fbe.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_47db6e386d54470daa14a44e2bb56c56.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_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 5492 bytes
SHA-256: e6b5197fcfa0fb04bf33396ca42817eabb6c1792f7da0cc36aee57801db5f45f
font_01_sfnt_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 14520 bytes
SHA-256: 90b9e98980337426d93a59dc11051f74eac58f2bba3f5ec4f1d8680b64997568