Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2a922328231cfd…

MALICIOUS

PDF

66.5 KB Created: 2021-03-14 09:28:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 655b4422690f4ee6464f104486dfff12 SHA-1: 492f8311bd7d7360e1b110fe8a00d3182f8f78e1 SHA-256: 4a2a922328231cfda8210594f2f8a9bcf52625182b6697033b474e5bec7f6f47
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to potentially malicious content or phishing sites.

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://fokemale.ru/wix?keyword=thermochemistry+heating+curve+calculations+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374360/normal_603fa4ebe9e99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387056/normal_6006f9b47c3df.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/pdf_algorithme_2.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/52097411351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5fff71dad0c8b.pdfIn PDF document text
    • https://gepadagonuvo.weebly.com/uploads/1/3/0/7/130775626/jamupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_600cb9a22b372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477173/normal_604809a337ad9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5ff24e97d71a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_6026d0dbd764d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367631/normal_5fff7846d0cde.pdfIn PDF document text
    • https://zijevalejo.weebly.com/uploads/1/3/4/7/134770519/1ec56.pdfIn PDF document text
    • http://kigetipopizatij.getenjoyment.net/focusrite_scarlett_2i2_mix_control_download.pdfIn PDF document text
    • https://zoxitujiwa.weebly.com/uploads/1/3/2/3/132302939/gonavawuposerafor.pdfIn PDF document text
    • http://tekupugu.sportsontheweb.net/zivozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_6048365dd2e30.pdfIn PDF document text
    • http://lezirumari.sportsontheweb.net/canon_6d_mark_ii_specifications.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/33671607481.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475872/normal_6007c7c1e051a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_601625965647b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_5fe7af7d3ce41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447251/normal_5fef42cfb47fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/edit_text_in_mac_preview.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_off0000c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 5480 bytes
SHA-256: ac91d5312c3da1b6568cbf3346e7f68e550018c15625b63bf85e9852255b1045
font_01_sfnt_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 9944 bytes
SHA-256: 95b63f50b69674ef8a0dba818a364f19ce2922aaca322a6c9510a99665c8215e