Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cd8bd240b9f4eb…

MALICIOUS

PDF

104.2 KB Created: 2021-02-15 19:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e1a80374dbf3266659a129dd6bc45020 SHA-1: 6a83b3e5ab07a30d980c8f9da14e76881d0e88c2 SHA-256: a9cd8bd240b9f4ebaa5bdc04a066571d3c5dabab1f67d91adcb3aa2fa95d35c0
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one heuristic specifically identifying a brand-impersonation credential phishing lure for Amazon. The presence of external URIs and a link farm suggests an attempt to direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a phishing attack, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://basitonivi.weebly.com/uploads/1/3/4/5/134584834/jenefojipoku-kexufaxereso.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://maypoin.ru/wix?keyword=cisco+3750+startup-config+is+not+present PDF link annotation
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/jenefojipoku-kexufaxereso.pdfIn PDF document text
    • http://eagleaff.com/adobe_sketch_ipadpczd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389821/normal_5fe45eb9ca095.pdfIn PDF document text
    • http://pe50off.pro/applique_pressing_sheet_spotlighth8jlb.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/8600962.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/dovasowapisomi.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/xovewijonowe-guvuj-ginolejarinabit.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/7cb8ca0e.pdfIn PDF document text
    • https://ximizewilaxeju.weebly.com/uploads/1/3/1/3/131381769/372dce8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_600bcb9c28c89.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/dovulavavo/79971050574.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/capitalization_worksheets_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/62434228961.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/amazon_prime_video_app_fr_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/72725198441.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/factorising_quadratics_worksheet_maths4everyone.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/29584857481.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/85867724228.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/73219509814.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_off00014870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14870 5596 bytes
SHA-256: 66fb926b6a0c78f21228008d3543b9601542fc93b5df84c17ca325146c566676
font_01_sfnt_off00015b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B94 12756 bytes
SHA-256: f8d17f611bb2cf37048fe77297b761634113538a5b66136154073d3b13c27b32
font_02_sfnt_off00018513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18513 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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