Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3410da9aa4456b…

MALICIOUS

PDF

78.3 KB Created: 2021-05-24 16:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: af2854a2352084fe3565cfb8f3f44efa SHA-1: 503c6ceebfa82787b33f97dd229e839cc6b905c6 SHA-256: 2a3410da9aa4456b2e4b8149b19ab845196eaeaedbb6dad1044ae5b69918fcb9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs that point to disposable hosting services, suggesting it is used to distribute phishing content or further malware. The presence of many external links and the use of disposable hosting are strong indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=how+to+use+one+handed+keyboard+on+ipad PDF link annotation
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/eeec98.pdfIn PDF document text
    • https://tulaliferejuza.weebly.com/uploads/1/3/0/7/130775137/jitowoxowi.pdfIn PDF document text
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/6481283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5fd6593d5bac7.pdfIn PDF document text
    • https://wikagigodoxuf.weebly.com/uploads/1/3/2/8/132814929/waxunelitawopowez.pdfIn PDF document text
    • https://jejegufixi.weebly.com/uploads/1/3/2/7/132740716/kemowofe_vudadazagan.pdfIn PDF document text
    • https://visunudit.weebly.com/uploads/1/3/1/4/131483005/b2a4a4fb223fa39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_602abb15aa410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_60318e4b89a4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5feb328097d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_602dfb57a16a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_603af2526eca8.pdfIn PDF document text
    • https://moduruwili.weebly.com/uploads/1/3/2/7/132710657/08923474a.pdfIn PDF document text
    • https://kotezoxeruv.weebly.com/uploads/1/3/5/3/135345651/8389604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_604699c9f30c4.pdfIn PDF document text
    • https://tebakoreku.weebly.com/uploads/1/3/4/8/134866173/padiwarife-muravunufo-gosolezavago-dizinesuxurot.pdfIn PDF document text
    • https://rilinozeni.weebly.com/uploads/1/3/1/0/131070652/pirunudewulaviwafo.pdfIn PDF document text
    • https://nijuvabuf.weebly.com/uploads/1/3/5/3/135326727/3323501.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ce1e27-389f-4796-a651-3d009c94758f/mojilugaboderijumuwuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fa1fa6-a307-47b7-b176-1eb7d9a33526/bekidikonowubabuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717fd119-0345-47bb-bc44-d723be61f387/you_write_1_million_in_standard_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf490ff6-6ca5-44df-b401-1835c51340bf/1242010087.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_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 5376 bytes
SHA-256: a95d4a9da9ffecc7d6181d361d5cd4fb0bede9faeba32f7e0d1ddb3c55e43c53
font_01_sfnt_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 10996 bytes
SHA-256: 8f89abf93af8f7f0764201985a8d33dccdb583e4f4bd63a757654e1af3ddaaed