Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cf234dc0589904…

MALICIOUS

PDF

77.8 KB Created: 2021-02-15 14:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e05e4a899d90077b3ff97caea861128 SHA-1: d7d73d901e56622b2443aa8c5caff0266371a6da SHA-256: d9cf234dc05899040c284575c6dd05c8dcb04b602ab52245149bb81fd8ffea8f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a non-benign purpose. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially malicious content, possibly for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://maypoin.ru/wix?keyword=cobb+douglas+production+function+practice+problems
    • http://kersita.space/indiskie_filmi_2018a5udk.pdf
    • http://profaudit32.ru/deuteromycota_caracteristicas25n3z.pdf
    • http://potaberukogox.66ghz.com/calendula_flower_mask_sheet.pdf
    • https://lekakuvikel.weebly.com/uploads/1/3/1/3/131380005/zisokowabup-jubiv.pdf
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/f6a972f8a340.pdf
    • https://vokevifiv.weebly.com/uploads/1/3/4/6/134657891/a67cdc0e9.pdf
    • https://cdn.sqhk.co/boxoveru/BgdtgeW/74475444954.pdf
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/pegimuv.pdf
    • http://guvizaw.22web.org/email_template_for_customer_service.pdf
    • https://cdn.sqhk.co/nomowaxiwo/ea7hbF4/bollywood_romantic_songs_2020_list.pdf
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/vaguvekage_zirizigoz.pdf
    • http://vojirumabi.22web.org/60161665150.pdf
    • https://cdn.sqhk.co/konafomaz/eC1owjf/poptropica_virus_hunter_island_guide.pdf
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/tepanatiwuga.pdf
    • https://cdn.sqhk.co/sivadapexiri/djgaxiV/toveripiraworobamub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vosimamasi.epizy.com/bioshock_2_plasmid_upgrade_guide.pdf
    • https://s3.amazonaws.com/wupixufekijax/asrock_bios_flash_utility.pdf
    • http://volajigatume.epizy.com/avoir_etre_faire_aller_worksheets.pdf
    • https://s3.amazonaws.com/pibajuwi/15187406528.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f041.bin
76544e679878846cfe6496026a080ae2fb8e7f3bec8d1940ef50dfe503db9eee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 5520 bytes
font_01_sfnt_off000102ee.bin
7174e19168034b57ecbd20c9aa9945fd7b064a134f443b25766813154a9152af
pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 11964 bytes