Malicious PDF — malware analysis report

Static analysis result for SHA-256 2085cd2e9e3352f0…

MALICIOUS

PDF

73.6 KB Created: 2021-02-12 14:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9bbdcc6a7a2cf5660c97dda8680bfbac SHA-1: eb9cbd4ced176a23be08345bf6aa32ec7b354d88 SHA-256: 2085cd2e9e3352f03eba98965e4358001cf7318bd9c76a6f025e3ae45ad180d8
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to lead the user to a secondary malicious resource. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

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://seumenha.ru/wix?keyword=nova+legacy+apk+download+uptodown PDF link annotation
    • http://profaudit32.ru/medical_certificate_cs_form_41exik3.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/hgjihdg/brick_crusher_hire_midlands.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5fe240d9eefa6.pdfIn PDF document text
    • http://udilische.club/2247201355g41wm.pdfIn PDF document text
    • http://d-youtube.com/avengers_main_theme_sheet_music_piano2ep5p.pdfIn PDF document text
    • http://pochta-24.cc/mordenkainens_tome_of_foes_free_online1qydo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_6015ccc7268df.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/2wgfqid/bufaxedusuzojafuno.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/hP7Qwgf/glitch_camera_effect_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/ggjFhhi/84271358415.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/h9hhnQA/nasikowenolebeku.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/kheieGi/55362637397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403264/normal_5fed1a09c2410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379482/normal_5fc93469b3db2.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/jbhjnvD/97634083656.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/cGgjAAF/90440792393.pdfIn PDF document text
    • http://mon-compte-cmb.best/kamolib6jco1.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/ghOjjWm/radio_caprice_synthpop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 5256 bytes
SHA-256: 7a89710764416a060f00c491631a653ff611e1f324535d15562da386c67a5e53
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 10372 bytes
SHA-256: 908ea4bd3bf0dd0192a3885ba9226f5f5663edc9587e3d5a151ea729e09cb7e2

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