Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ce82e041703fd4…

MALICIOUS

PDF

66.8 KB Created: 2020-11-13 06:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dd244e0fa638e6bf989a436d97521e3b SHA-1: b9c055753c4da46e1710ce8c7f8bc3f623a981de SHA-256: 38ce82e041703fd494d416b2e254503b3e7dd57235f4e582b448cc671b6be431
216 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. It uses brand-impersonation credential phishing. 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 0.9998

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xezojasupaxu.weebly.com/uploads/1/3/4/3/134352535/1033658.pdf.
  • 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://trafftec.ru/123?utm_term=haynes+online+manual+access PDF link annotation
    • https://xezojasupaxu.weebly.com/uploads/1/3/4/3/134352535/1033658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f920ef2c4b32.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/225593.pdfIn PDF document text
    • https://lolipakefupixo.weebly.com/uploads/1/3/4/6/134614949/969551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_5f954fb251ca4.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/6613868.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/fejuvo_novetiwobugud.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/jamokaroxoj/aphis_gossypii_ciclo_de_vida.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/52980378699.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/lorijolupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d32c90b-36ef-4028-89e3-5e709e1d5e27/super_mario_bros_theme_trumpet_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/82259115297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf720e6-0aa8-495e-b1ef-8276788985e1/xizapatob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d92e2d-3baa-46be-9a65-b40b0c5574a5/beth_chapman_weight_loss_2018_picture.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 4912 bytes
SHA-256: a5026fcd79326ba6648477ea720e0be19d77e6f313745efdcb69d9e2ac680486
font_01_sfnt_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 10596 bytes
SHA-256: 8bd1e1b68a93208bb4f40574efb56cedf3781b5662a65f9c57ed581be8f2f8c3

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