Malicious PDF — malware analysis report

Static analysis result for SHA-256 72adf441dd46a3e3…

MALICIOUS

PDF

83.2 KB Created: 2021-03-03 04:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 612c3f22ce36d02cd0e0c17ff0bd53e6 SHA-1: a858e924a4893fd9a6456704d0389c6681c7baa0 SHA-256: 72adf441dd46a3e32c3140770609ae7ca33bb0031605a45498edcefbce5a9c3d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://druttle.ru/award?keyword=heart+of+darkness+quotes+explained+with+page+numbers PDF link annotation
    • http://rubarenuruvofi.iblogger.org/cash_flow_statement_template_nz.pdfIn PDF document text
    • http://design-kvartira.info/762149114471epub.pdfIn PDF document text
    • http://scoretdho.best/sugar_sand_extreme_jet_boat4rafu.pdfIn PDF document text
    • http://mojizeki.22web.org/ap_eamcet_2019_bipc_key_sheet.pdfIn PDF document text
    • http://bionatur.space/damelidedivixasusazeridazjg8o.pdfIn PDF document text
    • https://riwivado.weebly.com/uploads/1/3/0/7/130739124/a926201.pdfIn PDF document text
    • http://verifybadgehelp.com/grand_academy_for_future_villains_2_walkthroughvgkl0.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/cd1f7.pdfIn PDF document text
    • http://ihsteam.ru/management_information_systems_degree_descriptionhvzpm.pdfIn PDF document text
    • https://furimubabo.weebly.com/uploads/1/3/1/8/131856330/digedirewevedezuvuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vizawog.epizy.com/adepta_sororitas_codex_7th.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/30654395974.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/current_date_vba_format.pdfIn PDF document text
    • http://murunujerumax.rf.gd/52132838353.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 5788 bytes
SHA-256: b88089de5d8e962af4bb751a9df5e45d3d28f07009aab3652872a92d7d9a919a
font_01_sfnt_off000112cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CC 10444 bytes
SHA-256: 7c54689f2fdae9c466f1a7741a204c215718bcc29da7236b3bbfc499e3f644a8
font_02_sfnt_off00013641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13641 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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