Malicious PDF — malware analysis report

Static analysis result for SHA-256 4467531c9045d73c…

MALICIOUS

PDF

75.2 KB Created: 2021-02-22 14:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 821c228f6f9000ff210e859a96632791 SHA-1: 1f2572f130e690a9f0a26dd01d390a7251950204 SHA-256: 4467531c9045d73c5296ee7124c317dda0ee7259b48a1bf3b8c87ed59287422c
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or SEO spam campaign. The ML classifier strongly indicated maliciousness, and the presence of external URIs points towards an attempt to redirect the user to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=belmont+middle+school+facebook PDF link annotation
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/8250609.pdfIn PDF document text
    • http://dalkomis.website/jakalemutojuwuvl6vie.pdfIn PDF document text
    • http://repaircreditscore.info/1051664329451yt1.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/rijipurekam.pdfIn PDF document text
    • http://idealica-columbia.site/9332034696520ddw.pdfIn PDF document text
    • http://kozlo.space/pinballz_lake_creek_reviewsnez4h.pdfIn PDF document text
    • http://universe1.space/47100006121n5pl0.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/7496675.pdfIn PDF document text
    • https://miwunogix.weebly.com/uploads/1/3/2/8/132814940/nitibe.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/jekiluk_tuweputug_kafotekepapawas.pdfIn PDF document text
    • https://masudokunu.weebly.com/uploads/1/3/4/7/134731157/zasagozotuse-nakizovadizane-bamipume.pdfIn PDF document text
    • http://idealslim-ordina.site/86731101601vt5zm.pdfIn PDF document text
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/lizagexeperole.pdfIn PDF document text
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/sipanoli-vogefi-jaluti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimiromomekex.epizy.com/bairagi_film_song.pdfIn PDF document text
    • http://sabukizazuse.epizy.com/brother_mfc_7340_driver_for_windows_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/23456966367.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/adi_shakti_mantra.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_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 5420 bytes
SHA-256: 11c9c17b1ed5295b7f6a24659acfaab9234bb786324881ef2dc1fbfe36f7078e
font_01_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 10188 bytes
SHA-256: 2c64c8f20dafa188a1fd360318c9ca9d0eef3bec9826fdeaa4670bb6e0ef206b

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