Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96455dbd42d44b1…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 19:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5341a286cbc24c3d19ffe40aa32aed21 SHA-1: 981e7542282b7cb4042105734d22de082112111c SHA-256: a96455dbd42d44b1c7149e278c4b147267f5b8de5b8d091a53ed1aaf88f7fdf0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware. No scripts were extracted, but the PDF structure itself is designed to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://gimoguvi.ru/strik?utm_term=why+does+my+cable+box+say+cast PDF link annotation
    • http://beviluxenumiliv.mywebcommunity.org/vemutezule.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/resnick_halliday_physics_volume_1_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fdc34986cdab.pdfIn PDF document text
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/2714160.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/lamuku.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/dij4sec/60535957575.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/59738991963.pdfIn PDF document text
    • https://xuxukogizi.weebly.com/uploads/1/3/5/3/135320654/4681201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_600d66361f035.pdfIn PDF document text
    • https://pemiroma.weebly.com/uploads/1/3/1/3/131383733/soxet_velodunezakutop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_601728f786ffd.pdfIn PDF document text
    • https://biwewonopegad.weebly.com/uploads/1/3/1/3/131380063/mipuben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459318/normal_6036509e1125b.pdfIn PDF document text
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/rovozapezimipowusili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_6013c5980dc50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litorow.myartsonline.com/48977305377.pdfIn PDF document text
    • http://pujumek.myartsonline.com/how_to_check_coleman_mach_thermostat.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/90849378894.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/acer_aspire_3_amd_4gb_1tb_windows_10_home_laptop.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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 5408 bytes
SHA-256: 8422cada541dfb51226f47da0a668ecb588333c97575c80f8a83c8ffd6754658
font_01_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 10308 bytes
SHA-256: 84509d1f26b523032bd6e0c0cee7bb04d738e9988dfc0bb81ab953b1aa2a8b2f

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