Malicious PDF — malware analysis report

Static analysis result for SHA-256 959bc92965225576…

MALICIOUS

PDF

79.6 KB Created: 2021-03-24 06:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 61dc168fc4e2a4edc407400310a2aa9f SHA-1: 1706de334987e8a81e6008c44f1ac3e9bde74fb9 SHA-256: 959bc92965225576aad9b7ecd693a0c67a11b0eab810f422fd065e7db0983e72
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. Several heuristics indicate this is a non-clustered link farm on disposable hosting, with 30 distinct links pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text appears to be garbled and likely serves as a lure, possibly related to SEO keywords.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=abap+development+for+s+4hana+pdf PDF link annotation
    • http://jnatural.space/diwomegivitevowi008xo.pdfIn PDF document text
    • http://5gusevshop.space/mht_cet_2019_form_feesl3npa.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/KTicHib/survival_island_2_dinosaur_mod_apk.pdfIn PDF document text
    • http://hookup154.online/when_i_fall_in_lovel25t9.pdfIn PDF document text
    • https://mipolokipum.weebly.com/uploads/1/3/5/3/135399848/9874021.pdfIn PDF document text
    • https://cdn.sqhk.co/josozudibud/FjizQuH/rc_plane_2.pdfIn PDF document text
    • https://cdn.sqhk.co/jedetanepiz/vggeypM/91398674687.pdfIn PDF document text
    • https://cdn.sqhk.co/xoripudesew/RghxhbX/the_bowling_family.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/PjaxsDI/99060088960.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • https://cdn.sqhk.co/tolononof/dRlGja8/color_switch_birdhouse.pdfIn PDF document text
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/vetezeli_jupafukuburuf_miduvabo_pupulovisozol.pdfIn PDF document text
    • http://opit.space/medieval_2_total_war_modify_unitsktl2m.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/Sijfjhz/rebel_inc_game_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/jJUIxig/77753949941.pdfIn PDF document text
    • https://cdn.sqhk.co/wukiratuxazo/Ajbghhi/diagnostico_del_cancer_de_pancreas.pdfIn PDF document text
    • http://politach.com/banglarbhumi._gov._in_khatian_plot_information_2019cx2k5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://votojoraxu.rf.gd/soduwurirusogufi.pdfIn PDF document text
    • http://monozalimixa.rf.gd/pobafonusagu.pdfIn PDF document text
    • http://pakafadudu.epizy.com/fovudusikojuretalu.pdfIn PDF document text
    • http://gezewezelatemak.epizy.com/resident_evil_4_apk_mod_hack_android.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_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 5560 bytes
SHA-256: 8db084fc22472b037076240c56373aa47e97caf638242c49c5e99c92a6c493c5
font_01_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 10716 bytes
SHA-256: 6d83adf38030df2f4d938e4f344ea03645aed44083c5f829d1215dcf8615c3ed

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