Malicious PDF — malware analysis report

Static analysis result for SHA-256 effa3cc63d2f6c38…

MALICIOUS

PDF

76.2 KB Created: 2021-02-08 06:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6af4a26398f1846642b0d6ad3355863a SHA-1: cd16c783da7d8bb499ee363beac395c9139053c1 SHA-256: effa3cc63d2f6c384118d5f2fea473c7c728369120796e713a83b02987b6d844
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to PDF manipulation, likely a lure to encourage clicks on the 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
  • 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://yafferge.ru/aws?utm_term=adding+text+to+adobe+pdf+files In PDF document text
    • https://kakerenu.weebly.com/uploads/1/3/1/0/131071145/593862.pdfIn PDF document text
    • http://pribor-poverka.site/36827368282i15ob.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/39753622536.pdfIn PDF document text
    • http://sarkife.site/gojenajukunuvasapefeto58bn.pdfIn PDF document text
    • http://freshnatur.fun/inquisitor_martyr_psyker_build9vadh.pdfIn PDF document text
    • http://itabody.space/jubekuluximifinuvegezopkxn4r.pdfIn PDF document text
    • http://domainlimax.xyz/moto_racing_games_free_for_pcb3t9h.pdfIn PDF document text
    • http://mmuuue.space/mermaid_skins_for_minecraft_pet4940.pdfIn PDF document text
    • http://site-shop.xyz/tobukejawoxeexcuu.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/gikghhb/riteranebivik.pdfIn PDF document text
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/4982314.pdfIn PDF document text
    • http://construt.site/bafabalujazesamemedemko2v.pdfIn PDF document text
    • http://ighelperscenter.com/formato_del_diagrama_bimanual_en_blancotzcpv.pdfIn PDF document text
    • https://betivaronapan.weebly.com/uploads/1/3/5/3/135350750/lodusevamevo_nipojavokowa.pdfIn PDF document text
    • https://feminudusur.weebly.com/uploads/1/3/1/4/131407357/gijodiwejo-weweganijeze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momugegunimex.rf.gd/82598202785.pdfIn PDF document text
    • http://famowasaj.epizy.com/car_racing_games_apkpure.pdfIn PDF document text
    • http://wedutatitupaze.epizy.com/bewudifole.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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 5308 bytes
SHA-256: 54b9ee9c5a15c211fbe5165e8b3cdcb8c1bedb88957e4cad676cba24ffa2ac65
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 10820 bytes
SHA-256: 5520aab278094f9dfeaa17e3396b39e05427c5a2c21a8b53c17276824d1f410b

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