Malicious PDF — malware analysis report

Static analysis result for SHA-256 1354a3a7ea50b1ec…

MALICIOUS

PDF

77.1 KB Created: 2021-02-22 15:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6876786b1225c0cad96bad065c437ad3 SHA-1: a24c123a96a7a56b6b1cb7e633bb6456b2c3f5cf SHA-256: 1354a3a7ea50b1ec976ec6e2649c5cb0c58a2e81d2155d6cab0246c96db553ab
184 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded links to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains references to 'Netgear router manual' and 'wkhtmltopdf', suggesting a lure to disguise malicious links. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=netgear+router+3700+manual In PDF document text
    • http://helps-lnstagramcopyrights-about.com/work_energy_and_power_problems_and_solutionsvjdkf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_600a942844795.pdfIn PDF document text
    • http://pokypka.xyz/cosecant_secant_cotangent_worksheetypsd7.pdfIn PDF document text
    • https://puzugisebo.weebly.com/uploads/1/3/1/4/131438758/kafatanovem.pdfIn PDF document text
    • http://doordash.fun/518117077940csdz.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/9939388.pdfIn PDF document text
    • http://pobasomitiji.22web.org/how_to_get_started_with_salesforce_career.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488332/normal_5ff7c4e15fe3b.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/9541695.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5febcc99401c2.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/chicago_format_citation_generator.pdfIn PDF document text
    • http://toxiwudogosos.epizy.com/yamla_pagla_deewana_2018_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/arcgis_10._6_with_crack.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_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 1528 bytes
SHA-256: 64d53b4318ba7dc869bcefe2c6c56431e6e12bcaf96a32242cfa9e17b755ba3b
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 5184 bytes
SHA-256: 99939ca4292a8dc224e321469ede8fd03a975d7a97cb6e99c2235f7a32ed3743
font_02_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 10992 bytes
SHA-256: f4af4e200963bf52d8f9c858cec7b28f8aec811bd2ab200b562807c10b7b5061

Open this report in the interactive analyzer, or submit your own file for analysis.