Malicious PDF — malware analysis report

Static analysis result for SHA-256 b186556e601e31c5…

MALICIOUS

PDF

72.1 KB Created: 2021-02-13 01:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d1456c25e53de53a50e9e41d7f12624d SHA-1: f1e3432043a4030ff3eaa3ef4248a2fd763fa836 SHA-256: b186556e601e31c58ff238d12f2757a21b362ec4d61819967065a53594811e44
66 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic firings indicating it is a link farm designed to redirect users to external sites. The ML classifier strongly suggests malicious intent, and the presence of a URL related to 'plex pass premium apk' points towards a scam or phishing lure. No scripts were extracted, but the overall structure and URL usage are indicative of malicious redirection.

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://leonvi.ru/wix?keyword=plex+pass+premium+apk PDF link annotation
    • http://liketsven.xyz/541574100728y4ml.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_600bd40929349.pdfIn PDF document text
    • http://lienforkid.com/bachelorette_party_invitation_templates_free_microsoftjapt3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_6017f7dfe4c81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480423/normal_6007e88ea5438.pdfIn PDF document text
    • http://natlab.ru/hunger_games_2_ita4wn31.pdfIn PDF document text
    • http://chemistryplus.space/formula_car_crash_racing_2020_mod_apk0r8v2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_5fd72a323787a.pdfIn PDF document text
    • http://gufutaca1.xyz/learn_japanese_for_free_with_kawaiinihongo_apknjhns.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416790/normal_60093f26600ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_600c3c2b30ac7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5ff63869f114e.pdfIn PDF document text
    • http://maxidadikegi.iblogger.org/phonics_worksheets_for_preschool.pdfIn PDF document text
    • http://vquest.website/baby_bingo_template_free49nr2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_601a21a6374ab.pdfIn PDF document text
    • http://jazeforip.22web.org/vat_challan_form_in_word_format.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://finesegugumemo.epizy.com/gibson_f_hole_template.pdfIn PDF document text
    • http://jawedujap.rf.gd/calculating_density_worksheet.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_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 5100 bytes
SHA-256: f414a87fa088aa73518d3afe665561038b9d4aa493725a7e3f0e506788c4d6a6
font_01_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 10368 bytes
SHA-256: eae45c3b5bc4c3416bbcfe700d2e4191e14dd45abe55f990eab52c9f78501a5b

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