Malicious PDF — malware analysis report

Static analysis result for SHA-256 03618c8b17fc267b…

MALICIOUS

PDF

78.4 KB Created: 2021-04-27 00:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 828bd0937ec8709881f726d679c81b7a SHA-1: 6ebddfd87030fdfacaa07c7dcec06b9f8a8cf163 SHA-256: 03618c8b17fc267bc9d751c728485300d0e1b80a25b5255d7820aa1c6e3520a1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, consistent with a link farm or SEO manipulation tactic. One of the primary URLs, https://jacksth.ru/strik?utm_term=cool+interior+design+ideas+minecraft, suggests a lure related to interior design ideas, potentially to disguise the malicious nature of the links. The document's structure and the presence of numerous external links strongly suggest it's designed to lead users to other potentially harmful content.

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://jacksth.ru/strik?utm_term=cool+interior+design+ideas+minecraft PDF link annotation
    • http://govejulij.22web.org/lubejerefirewijejeg.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/Hghle9I/51004547687.pdfIn PDF document text
    • https://cdn.sqhk.co/dozawulu/PugfHgj/15016356161.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/96044094087.pdfIn PDF document text
    • https://kefavemi.weebly.com/uploads/1/3/4/0/134042724/nobadopali.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/Sjjqbjb/tamil_romantic_cut_songs_free_download.pdfIn PDF document text
    • http://fajesamosini.sportsontheweb.net/common_english_words_with_tamil_meanings.pdfIn PDF document text
    • http://mogisut.medianewsonline.com/architecture_risc_et_cisc.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/bloqueo_av_congenito.pdfIn PDF document text
    • https://vagofavom.weebly.com/uploads/1/3/4/4/134486407/7674320.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_ce351d0929c44d3485050573167db782.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_861f09ede5da41d892b94aa13c23a33f.pdf?index=trueIn PDF document text
    • http://jemavavobeziv.epizy.com/1269380338.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_8ed6d28672fc4cc2a4d4571194d51400.pdf?index=trueIn PDF document text
    • http://nodefojabotozij.rf.gd/tarot_images_free_download.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_acf22e83fa1d48698f34772490bf3c61.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_a0d61880c30e466b81e54ebea71f121a.pdf?index=trueIn PDF document text
    • http://kepofif.onlinewebshop.net/mejur.pdfIn PDF document text
    • http://rasiritodir.rf.gd/cantaloupe_island_piano.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_f7f96b75c6634d0abe3c950f71441522.pdf?index=trueIn PDF document text
    • http://bopunuzas.rf.gd/61298391559.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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 5248 bytes
SHA-256: 95d2fb248f64b57e3c96b051cf4de9820c9da47fea7bca4c06914f1ce40f203d
font_01_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 12732 bytes
SHA-256: 27dbaf6aec4712be43b6acf5c27796218a8b3bebf2eae3c06b2f8fea68ad9176