Malicious PDF — malware analysis report

Static analysis result for SHA-256 58446c1f1fb6e953…

MALICIOUS

PDF

72.0 KB Created: 2021-06-14 02:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7f52f443d113ce34a427b9f120b90b8a SHA-1: 5400ad79e07c4d69d46b3ee735b90681f75b05cf SHA-256: 58446c1f1fb6e953386c4f2055e7f5da8bf9100adf96b3824b6ecf9aa7839132
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/pbw?utm_term=convert+mp2+to+mp4 PDF link annotation
    • https://zirefugat.weebly.com/uploads/1/3/0/7/130740019/toboxuxivur.pdfIn PDF document text
    • https://lodunuvivilaz.weebly.com/uploads/1/3/0/7/130775731/kobitalebupakem-jilawo-bomakej-raboliteje.pdfIn PDF document text
    • https://mubikobilowopo.weebly.com/uploads/1/3/0/9/130969089/6cea8adcb7b00cd.pdfIn PDF document text
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/c7d2f87f8edfd.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/mokudop.pdfIn PDF document text
    • https://vofutomafete.weebly.com/uploads/1/3/4/4/134463257/852083.pdfIn PDF document text
    • https://xixiduduge.weebly.com/uploads/1/3/4/7/134713202/bakoz-jumeron.pdfIn PDF document text
    • https://bederoka.weebly.com/uploads/1/3/4/8/134886295/55af360a20ccd65.pdfIn PDF document text
    • https://dikubone.weebly.com/uploads/1/3/4/6/134603537/2145900.pdfIn PDF document text
    • https://loremodowudoro.weebly.com/uploads/1/3/2/7/132712063/lenagopugixazu-maledomawo-dojinimo.pdfIn PDF document text
    • https://fogisavelubid.weebly.com/uploads/1/3/5/2/135299906/9301374.pdfIn PDF document text
    • https://zeregosuw.weebly.com/uploads/1/3/6/0/136055393/6508cc9fb2b298.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/zixosawamex.pdfIn PDF document text
    • https://xosotemup.weebly.com/uploads/1/3/4/3/134367608/70586f.pdfIn PDF document text
    • https://bojojibapofaz.weebly.com/uploads/1/3/4/4/134478515/2a3ad34ed396b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/471702f1-3e7a-4dc9-8311-9b9c926c212a/30322942038.pdfIn PDF document text
    • http://pimepovume.pbworks.com/f/hazard_identification_and_risk_assessment_template_for_hospitals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7274087-3f61-449f-adfb-d382debaf10a/pisawi.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144484752/dodujiruxumerajamev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/631da154-56de-4ad6-a824-ccffb9a98ad2/16194034727.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144622089/365_bible_verses_on_fear_not.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_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 4728 bytes
SHA-256: 7a5f33fa461eb2c0026c02930170a557243ea2d3de935c9a1ea4e91ddcb02250
font_01_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 10392 bytes
SHA-256: 88ccb397eee99d12270d75da8097133e56d72c60bbfb4bc35624d092353a3698