Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4bb36229a67c53…

MALICIOUS

PDF

80.5 KB Created: 2021-02-22 00:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 151fbb218caef296eed70f0e327f013f SHA-1: 13b601ee6a538b903e61835b2f525268fa9b0450 SHA-256: cd4bb36229a67c53d4ccb5abdb2ad978943487544257042581f6554a50fbdadf
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and appear to be part of a link farm designed to drive traffic. The document body, though heavily obfuscated, contains keywords related to search engine optimization and the primary URL suggests a lure related to 'ffxiv direct chat'. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for SEO-based redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=ffxiv+direct+chat PDF link annotation
    • https://cdn.sqhk.co/sidogorego/UAOhd9A/draughtsman_meaning_in_punjabi.pdfIn PDF document text
    • https://gazasajud.weebly.com/uploads/1/3/4/8/134879445/wisiteku.pdfIn PDF document text
    • http://flymoney.net/azar_elmas_hilesi_apk_2019838zm.pdfIn PDF document text
    • http://dragonflysagewellness.com/what_kind_of_battery_does_a_red_dot_scope_take29ek8.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/hb0zjgz/star_wars_squadrons_vr_support.pdfIn PDF document text
    • https://cdn.sqhk.co/gavoduse/iP1idid/ditopibowazux.pdfIn PDF document text
    • http://weinmvc.net/google_sheets_how_to_wrap_textfhxk7.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/geif1b9/gamaxowerufupin.pdfIn PDF document text
    • http://my-credit.info/ecological_modellingy7gsb.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/dexub.pdfIn PDF document text
    • https://pamokevavazodo.weebly.com/uploads/1/3/4/3/134386981/49492d8b7a29c5.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/gcggjhj/nixes.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/ighhCge/47552499756.pdfIn PDF document text
    • http://moneymaya.site/kavaturusikupigelj7a1y.pdfIn PDF document text
    • http://agentsoft.space/neregubijojavemaxog6te8.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/drhcEjh/hook_up_playstation_controller_to_apple_tv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vazorilumi.epizy.com/75662268423.pdfIn PDF document text
    • http://bupelasupur.epizy.com/soguwiwim.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_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 4984 bytes
SHA-256: e6193b158d486f879c402ceab5ed43a8b3688961e36e9c376b764977b64883bd
font_01_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 11060 bytes
SHA-256: 8714db36d885e3cf3cffeadb4ff03f93115ec4852e937eefb3830fa13bc6f45d

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