Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79b965b71f7804c…

MALICIOUS

PDF

79.6 KB Created: 2021-04-10 15:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b74416f1935746b30b4b7767ef866946 SHA-1: 20c756f20e6099e31af32d68e62ce862ecaef121 SHA-256: e79b965b71f7804c33ef751145c932fa4a5de703fdc69c54bbf47986ee0efe66
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with one prominent URL being a redirector. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or SEO-based malicious redirection. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://druttle.ru/strik?utm_term=breakfast+at+tiffany%2527s+novella+analysis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471711/normal_604d396e856ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470843/normal_605f680fda71e.pdfIn PDF document text
    • https://cdn.sqhk.co/kisoxukapab/eWGjfdh/vr_karts_sprint_oculus_quest.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_601e7cb2a7be9.pdfIn PDF document text
    • https://mavuniwotikabu.weebly.com/uploads/1/3/4/3/134324734/tolezelesa-legobin-newaxa-demevulerirela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478667/normal_603e088db75cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_60484fdc96439.pdfIn PDF document text
    • https://pobasejedewepiz.weebly.com/uploads/1/3/4/0/134017346/jizutemorojegap_senuwevuzikafoj_golix.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/hijjjjd/tujujutimapovirilopisejus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_6012c86dcd19a.pdfIn PDF document text
    • http://denazofumoxebo.iblogger.org/23802155512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_603bee79615ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369150/normal_5ffe21528a9bf.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/4000817.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/2921278.pdfIn PDF document text
    • http://gujinir.22web.org/dark_souls_remastered_wiki_weapons.pdfIn PDF document text
    • https://wogizirimabote.weebly.com/uploads/1/3/5/3/135337148/bupozoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/winumigutam/how_to_clean_filter_on_dehumidifier.pdfIn PDF document text
    • http://xefivaz.epizy.com/85094230355.pdfIn PDF document text
    • http://noborixujap.epizy.com/navy_radiology_tech_school.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/79126207039.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_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 5068 bytes
SHA-256: b89246e998778dde3565c60f9686265a069277017e14281276f897eae86a2f45
font_01_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 10344 bytes
SHA-256: e457db6db5ff14e27ccabbb2409e240b94a9c112f651e600fe7dd784834421fe