Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0924003f417e626…

MALICIOUS

PDF

79.3 KB Created: 2021-05-06 03:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 070cc54ba6d07059c212ef195e1e56ed SHA-1: af9cec6a6d4638d354d462576fd1ee2e018bcc7f SHA-256: c0924003f417e626579ae45927d4b8e093d68c3fed9c11055c8dc90df409c123
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 pointing to disposable hosting, indicating a link farm designed to distribute traffic to various malicious or phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=sat+calculator+programs+ti-84+plus+ce PDF link annotation
    • http://kind-insta.site/solving_equations_with_angle_relationships_worksheetsqv7vv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_6006f8dc8d50b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_6014a16ff07fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_6059a309c645a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_602cdfd8dc084.pdfIn PDF document text
    • http://xikisavi.scienceontheweb.net/55879752866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_60384eab59d6c.pdfIn PDF document text
    • http://aycotoro7.xyz/winojixifalozafikusefg1l9v.pdfIn PDF document text
    • https://wifivufadabigo.weebly.com/uploads/1/3/4/5/134522009/pulireb_tizex_burotadexenuv.pdfIn PDF document text
    • https://wadodimimilupe.weebly.com/uploads/1/3/0/8/130873890/5986542.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/lifufomikaw-sofogugutiku.pdfIn PDF document text
    • https://zudobusida.weebly.com/uploads/1/3/5/3/135330479/5622199.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/ninotuseselelabanis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382197/normal_5ff4c1de352ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462714/normal_60598116c0586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_660052dd7c5f472182efc92682847455.pdf?index=trueIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/differential_diagnosis_appendicitis.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_08fe267b04554b8b995c959c33b82305.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_ba8b841f5f244765b7ef4fb5079534f8.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_91441abce04942b896649610f9b5be24.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_e99fcec51c6043e49e184d41093fb1ff.pdf?index=trueIn 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_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 5668 bytes
SHA-256: c15595bba3d797842a3a5423757ff1ed3491a352424376f00ae2d819ab4bc087
font_01_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 11584 bytes
SHA-256: 3a4aa3d4c22cf8c0bedfea51fd543cb475e14750440379c92e77f3fd30b29913