Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f07c587bcd0d91b…

MALICIOUS

PDF

85.6 KB Created: 2021-05-02 21:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f5272d90948273ff9997cb4a2fd7614e SHA-1: 25468becf55b667583dd30a242245f448d6580b9 SHA-256: 5f07c587bcd0d91bd5ecb4f0a09b8483b4d82040050d7416fdb47dbd805e1ce6
204 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are hosted on disposable domains or known malicious redirectors. This indicates an attempt to direct users to potentially harmful content or phishing sites. The presence of PRC/3D content and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 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.
  • 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=multiple+intelligences+visual+spatial+activities In PDF document text
    • https://zeleloda.weebly.com/uploads/1/3/0/7/130776222/tixas-vexidam-tobotuzuwonipew-bikog.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/marantz_sr5007_review_what_hi_fi.pdfIn PDF document text
    • https://cdn.sqhk.co/vixokezafafu/WhjrCe9/technicolour_beat_piano_sheet_music.pdfIn PDF document text
    • https://vusubidasezojix.weebly.com/uploads/1/3/5/3/135399418/58576cad5c.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/camille_paglia_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/umJjfij/vpn_for_pubg_free_app_to_use.pdfIn PDF document text
    • https://cdn.sqhk.co/jiledexuda/Uk4Nqjh/dueling_banjos_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/gjchfhe/rametot.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/gZLgiCh/66433703935.pdfIn PDF document text
    • https://tepewumulu.weebly.com/uploads/1/3/1/3/131384412/kufodugeguxem-gixiwe.pdfIn PDF document text
    • https://luselovuxetox.weebly.com/uploads/1/3/0/7/130739290/38ef20c634.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/SNohb1U/dofalasere.pdfIn PDF document text
    • https://cdn.sqhk.co/vemosoveveb/hbjiczv/44269267495.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/hgfjfjh/medepeperipukedivig.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/figiihg/fagitegadifon.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/9idpKih/gasebozafifamajabomuvipa.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/c0feea81-32e1-4600-bbdd-f4bc19f84c9d/widefeku.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/dezagizaxelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca4b571-7208-47a0-89af-84395b9a1af9/gibefobujum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45b11d7-4f80-460e-bb64-56f169f9042f/cloud_security_alliance__self_assessment_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8777003-7c97-4856-a7fc-1263709e20dc/fusaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f869ec5-968c-4841-af04-5499c7c66e13/bozudatagi.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_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 5068 bytes
SHA-256: 022900e79c980f30dfa00109cc26c0495670a6f141b801e73501cdac7d7f0a46
font_01_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 13096 bytes
SHA-256: 41e4fc109bbeb0d1ef2e258c559e59582c00f51347197c83508515ca8adef9cc