Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5c748d026caf14…

MALICIOUS

PDF

73.5 KB Created: 2021-02-24 07:00:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 39cf379855b3843975b9d40512c7a7fe SHA-1: e8079a68c11fd887d11a433c7734b604f84e2e76 SHA-256: ea5c748d026caf14bfc3d7b6dcd3e45f0df04416f388fecae87f839b88bc612e
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier strongly indicates maliciousness. The primary purpose appears to be directing users to a multitude of other PDF files hosted on disposable domains, likely for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://seumenha.ru/123?utm_term=professional+event+coordination+julia+rutherford+silvers+pdf PDF link annotation
    • https://cdn.sqhk.co/revinoxu/ghkj8ih/xawesibilukafajof.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/najube_nebamosotapos_lisak_buxomatededip.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/uYYhfA3/wamepunugi.pdfIn PDF document text
    • https://lijafaxad.weebly.com/uploads/1/3/5/9/135989690/cbc57720a2.pdfIn PDF document text
    • https://wibidonegaka.weebly.com/uploads/1/3/4/5/134599285/0c887f300.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/uLjjhj2/26800555347.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/jgipX5n/veronica_mars_the_movie_cast.pdfIn PDF document text
    • http://jixuboxa.iblogger.org/mubeparifikigipumizeb.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/bkjaJij/givolixomefa.pdfIn PDF document text
    • https://cdn.sqhk.co/nudotunaza/aXifb4K/skip_bo_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446499/normal_602470525564b.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/k3ibjc7/dinovotetidukawupipufik.pdfIn PDF document text
    • https://fukidupedogof.weebly.com/uploads/1/3/2/8/132814182/1639a69.pdfIn PDF document text
    • http://pobasomitiji.22web.org/20163086515.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/ahacq8M/3249454095.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/bewibiwat/bizhub_c258_spec_sheet.pdfIn PDF document text
    • http://pasivete.epizy.com/muzaguralupavigomijuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/marry_your_daughter_piano_sheet.pdfIn PDF document text
    • http://bemogabidemixu.epizy.com/veviz.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/ccleaner_for_windows_10_free.pdfIn PDF document text
    • http://bizepusozuj.epizy.com/do_you_capitalize_job_titles_in_essays.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/wedomowekupifasatimovam.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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 5380 bytes
SHA-256: 09910c90566888f2f04142b45418b6f023a90b6f2ee79648a8e107693220ac2c
font_01_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 10500 bytes
SHA-256: dcd95bead67b3d83f856962247e3a85058354b3600eb7b941ea5d986c358f9ac

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