Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c8650f0fbb644f…

MALICIOUS

PDF

82.4 KB Created: 2021-03-18 14:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c2a385fe8b673bb738aa41bdba8e8b20 SHA-1: 9e973c8832bbbb60d67a00afb7458e722314d7bb SHA-256: 90c8650f0fbb644f2ff36df53acd21ab25a43ad384b51c04395c602c0cef8725
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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 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.
  • 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://jacksth.ru/strik?utm_term=ariens+snowblower+oil+change PDF link annotation
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/xuxobuvedod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_600f87b0b9467.pdfIn PDF document text
    • https://litaduzava.weebly.com/uploads/1/3/4/4/134499200/5ca8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_602e3df265cc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_6003e6b2b26f5.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/fufabudekufegus.pdfIn PDF document text
    • https://solejibanumiro.weebly.com/uploads/1/3/4/4/134489880/gijenunupip_suliv_muramesawatix_badebogipibuxab.pdfIn PDF document text
    • http://zomosidotewe.sportsontheweb.net/vagurez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nitajosasa/ayumilove_training_guide_maplestory.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/html_css_templates_free_download_responsive.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/cacaoweb_org_page.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/kepelbagaian_budaya_di_malaysia.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_9e6c198cb56545afb87b4a69a5714e7a.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_be36eca1e3f347dabc3b35006aaa25d8.pdf?index=trueIn PDF document text
    • http://xepuzakudera.atwebpages.com/weight_loss_workouts.pdfIn PDF document text
    • http://xevijojikutep.onlinewebshop.net/45598211855.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_efe5bb573fb04e00a051742db0255081.pdf?index=trueIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_f46ec70c91324c82bb271e451a61eb53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/schema_del_purgatorio_dantesco.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/how_to_deal_with_conflict_social_work.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 4992 bytes
SHA-256: 52ba1ae06ce1651424c47c2c7a25448fe6f765076df0acbb065e8ac38dcacae9
font_01_sfnt_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 11804 bytes
SHA-256: 1de02bec36eb2bb3fe4fecb60ad95bb1b94a8a241981b597d7a4493bd81cadfc
font_02_sfnt_off00012f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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