Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a73f518480084a8…

MALICIOUS

PDF

74.5 KB Created: 2021-01-31 20:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 10b3a0652030b66d1f2056630452c6ff SHA-1: 98edb198637174abda35518113767e594394f3f8 SHA-256: 9a73f518480084a89caed7a9ae3f56f2bc1a3458c11c0212bfc042458c965b32
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and is part of a link farm hosted on disposable infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely leveraging JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=basic+building+blocks+of+a+protein+are+called In PDF document text
    • https://nidapekosoko.weebly.com/uploads/1/3/2/7/132740606/mizeralaliruxipapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457560/normal_5fc7335a86650.pdfIn PDF document text
    • http://summer-italy.fun/world_chef_mod_apk_ios6ipqz.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/zedaruvasusab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_5fe752136b86f.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/likepibanarav_nelomoda_gatapiboxe_logotuwemeri.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/8917901.pdfIn PDF document text
    • https://sazalilo.weebly.com/uploads/1/3/4/5/134592982/xirugov_lemiduxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455673/normal_5ff7cd1e4f6d3.pdfIn PDF document text
    • http://sell-toclick.online/warship_battle_3d_world_war_2_input_codecimji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476938/normal_5ff1b6ccc32f8.pdfIn PDF document text
    • https://dedopaka.weebly.com/uploads/1/3/4/4/134498192/zanidav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tazafira.epizy.com/wewitudipin.pdfIn PDF document text
    • http://rozazidugo.epizy.com/xoxepikos.pdfIn PDF document text
    • http://gigavolaxo.epizy.com/joroburovozidarunetixu.pdfIn PDF document text
    • http://vutakeba.epizy.com/les_automate_programmable_industriel.pdfIn PDF document text
    • http://wetavirevamo.epizy.com/38833341836.pdfIn PDF document text
    • http://tixelupaninaber.rf.gd/levanto_surf_report.pdfIn PDF document text
    • http://pekagotikoweguf.epizy.com/72299541620.pdfIn PDF document text
    • http://rimamosapike.epizy.com/91095704188.pdfIn PDF document text
    • http://fegujepopofesa.epizy.com/batman_hush_eng_sub.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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 5576 bytes
SHA-256: 0258fabcb3055bd2767032839e767adca001e83034c10a3ef3fc6f7b1aa4acae
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 10404 bytes
SHA-256: 6f3633a6d3e82d62a648601b026458deb15142c1dcc8ecf3ce419c4933c8069e