Malicious PDF — malware analysis report

Static analysis result for SHA-256 19aa07c415559583…

MALICIOUS

PDF

75.1 KB Created: 2021-03-03 18:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d3b682157e25c939e659dfca614d9fb0 SHA-1: b05f8c832b4533892f24f298599cb5ca917a0408 SHA-256: 19aa07c4155595835f291698dec62aa3d984cdd03615eed2a183d4c6e0069db3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://crophysi.ru/strik?utm_term=brother+mfc-7840w+printer+specs PDF link annotation
    • https://cdn.sqhk.co/zakikola/Gifjcjg/81795713408.pdfIn PDF document text
    • http://hookup755.fun/what_is_educational_psychology_explainz2adm.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/iejcwPd/nateponuvolubopis.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/fD9iqbh/youguides_get_views_likes_subscribers.pdfIn PDF document text
    • http://yewes.fun/large_format_camera_parts_for_salednbnb.pdfIn PDF document text
    • http://submonster.xyz/nigofabibutumakofaka3fj.pdfIn PDF document text
    • http://nogivubuleduwi.22web.org/metro_map_moscow_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/sony_a6500_kit_lens_price_in_pakistan.pdfIn PDF document text
    • http://nujebij.onlinewebshop.net/fowumis.pdfIn PDF document text
    • http://vopepogam.rf.gd/60355950487.pdfIn PDF document text
    • http://nabunuwo.epizy.com/create_a_spreadsheet_template_in_google_docs.pdfIn PDF document text
    • http://pesufebavarobi.rf.gd/manualidades_para_navidad_con_fomi.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/securecrt_file_from_server.pdfIn PDF document text
    • http://pupokimixuveted.epizy.com/62459493187.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/7482459398.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_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 5688 bytes
SHA-256: 02cd85980d10cb7681035c442a1ec1707f7cc603ecb58dfd3f478be5124b71aa
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 10992 bytes
SHA-256: 4d0aab6ab31d789e09f06738c02b0605854196f82d79f6c487776041b8795868

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