Malicious PDF — malware analysis report

Static analysis result for SHA-256 157713c44239b422…

MALICIOUS

PDF

72.9 KB Created: 2020-12-17 12:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8838e26d2a3077fe593417ca5f03fee3 SHA-1: ebf138755801cc35f4a9e4410bda5fb309cafddb SHA-256: 157713c44239b4222c73b5f90b16d522282921bf41226536cbd76b1f683fd7b7
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1055.012 Process Injection: Process Hollowing

This PDF file is identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier output of 0.999750. The document impersonates eBay and contains a link farm designed to lead users to phishing pages, likely for credential harvesting. The presence of numerous external links and a disposable hosting domain suggests a campaign focused on distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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://sitegevom.weebly.com/uploads/1/3/4/6/134664280/fedebibagibipanibodi.pdf.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/strik?utm_term=summer+waves+pool+parts+canada PDF link annotation
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/fedebibagibipanibodi.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/c5cd6762.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/tuvironinoj-tevokefen.pdfIn PDF document text
    • https://jewiwepetaj.weebly.com/uploads/1/3/4/7/134752938/xidupogupanev.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/897a8.pdfIn PDF document text
    • https://xogaketur.weebly.com/uploads/1/3/4/5/134593565/vugelowebuxaz.pdfIn PDF document text
    • https://nulosomeka.weebly.com/uploads/1/3/4/6/134605351/4925756.pdfIn PDF document text
    • https://rekoxexegatetun.weebly.com/uploads/1/3/1/4/131452740/1501262.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/riganesumavif.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/35cc265e7ad.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.pdfIn PDF document text
    • https://sitixibabu.weebly.com/uploads/1/3/4/7/134749551/lelefeti.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://uploads.strikinglycdn.com/files/ebfbc95c-b1b2-4add-8bc2-4dc8d407b1b4/ucsd_pc_room_reservation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb840409-dcc0-4f22-800c-ef37195b9868/bozezusudimamos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b768c4-4f56-4550-8c67-799b3384b060/unblocked_fishing_games.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_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 5308 bytes
SHA-256: 117b08fea3a081dde78bd298ee1ce8dcfe8eb3b316d84f45a5f82bc62d1bcfe0
font_01_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 10696 bytes
SHA-256: a3e9b2599d1c9ddf8b6afdee656fa1f69e89936387f6bb48d7c44eff413a7a64
font_02_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176