Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dce983ffd99463c…

MALICIOUS

PDF

74.6 KB Created: 2021-05-24 07:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 049ef26c2fd121e0fbc74f7a4b798b83 SHA-1: 6eb936e8f19a66d829afe462a7e9803d7ec11c01 SHA-256: 0dce983ffd99463c86d3e5ad172a696c09f7cea24f2810f22dd2e73895201222
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, and the document body is heavily obfuscated, preventing a more detailed analysis of its specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://fujovufizopi.weebly.com/uploads/1/3/2/7/132710671/nuguxal_dosoxexojes_bevozuzal_xepogukemuzal.pdf In PDF document text
    • https://gixatupugibezi.weebly.com/uploads/1/3/5/2/135296842/3002359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446790/normal_603c1df77abec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_606aca369c704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421781/normal_5fccd23d2d22d.pdfIn PDF document text
    • https://verigidiloje.weebly.com/uploads/1/3/0/8/130874422/kidiwagiranodawu.pdfIn PDF document text
    • https://wogakidip.weebly.com/uploads/1/3/5/3/135384189/fezipo.pdfIn PDF document text
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/7683695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_60126e95ca6fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_603b2cae0ef18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_605d9913b711d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447084/normal_5fc6fed1ebcca.pdfIn PDF document text
    • https://balusapox.weebly.com/uploads/1/3/1/3/131380564/zoveg-tupidiwebe.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/varinulabebu.pdfIn PDF document text
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/3467626.pdfIn PDF document text
    • https://lugulake.weebly.com/uploads/1/3/4/7/134763312/b8999de6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384644/normal_6007e948b1d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_602002041095c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/jJyWpsOf3IE/wb?keyword=doctor%20who%20ghost%20in%20the%20machinePDF link annotation
    • https://s3.amazonaws.com/sinadi/8652733381.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/que_contiene_un_proyecto_de_investigacion_cientifica.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/fuvipemaxefudez.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/54046919800.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/insectile_template_3._5.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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 5272 bytes
SHA-256: d32c13a2f8ed3e0ab0f43d20c74ab57130ff9164c6772a5d4d4cefdd3fe95bb4
font_01_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 10772 bytes
SHA-256: 2395f81a7fa0e4f86ecb26c8e380ced5989d70ed00cebe22eb40c577c4d476f9