Malicious PDF — malware analysis report

Static analysis result for SHA-256 12958b9298bb7036…

MALICIOUS

PDF

82.4 KB Created: 2021-05-06 16:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9755e1ba6fb3bc8aec0fc36fa38afa6b SHA-1: 980fd61ee8fadb7430509d6c765026bba0e9c3fb SHA-256: 12958b9298bb7036105ba7e93611d0e4a501f8e3e6d1581e37a1348fc401fea1
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDF documents hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or to distribute further malware. The presence of numerous external URIs and the link farm heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://dafemum.ru/strik?utm_term=what+are+the+aiag+core+tools
    • https://vobulesije.weebly.com/uploads/1/3/1/8/131857334/foxonifowixa-xavoj.pdf
    • https://cdn.sqhk.co/denirinodo/ih1giQe/du_application_status.pdf
    • https://zavexirated.weebly.com/uploads/1/3/2/6/132695663/2852565.pdf
    • http://keep-travel.com/the_mandalorian_season_2_cast_listid6oz.pdf
    • http://levantemosaic.com/michael_vey_book_3_summaryz0ioi.pdf
    • https://cdn.sqhk.co/jotapepikota/iQbifjc/82472869890.pdf
    • https://mawetifatine.weebly.com/uploads/1/3/2/6/132683292/ninofanusezapakug.pdf
    • https://cdn.sqhk.co/nemoludajedu/wddXnii/cruise_ship_deck_plans_princess.pdf
    • https://cdn.sqhk.co/zuzipogowita/hhjeIgc/knights_of_labor_main_goals.pdf
    • http://fakaripeti.xyz/reglas_de_calculo409el.pdf
    • https://lumezoti.weebly.com/uploads/1/3/4/8/134863392/vimuzoj-lelejederutela-wufikus-mulasomed.pdf
    • http://insurancecarusa.com/76991133326uhimu.pdf
    • https://madoguwulivusi.weebly.com/uploads/1/3/0/7/130775056/8e629167cbc1.pdf
    • http://argo-tourism.com/elements_of_statistical_learning_hastieati6j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_cb489e17936c4a5ba18535dd718d9d8f.pdf?index=true
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_3c3ccd51e391467c95c15489a1c3b385.pdf?index=true
    • https://s3.amazonaws.com/pipaneku/90689197114.pdf
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_ba79fdf45b87490ab94f4a7557fb1520.pdf?index=true
    • https://s3.amazonaws.com/woberiz/oracle_database_12c_guide.pdf
    • https://s3.amazonaws.com/bufexa/jazakotomujogipi.pdf
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_89478853a4b546d59fafc824f7d432e1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f3.bin
e7f07e80ab4b1ccfd722d96e2b2aaa48f83b41a68ab1df630417624d068306bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 4756 bytes
font_01_sfnt_off00010838.bin
265d0ed5edc04fa2b25bd4164de8e2c5f450b36e8000083f9b1ad97c17e3c57f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 11224 bytes
font_02_sfnt_off00012e5f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5F 4324 bytes

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