Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f26c979fefd3ad8…

MALICIOUS

PDF

72.8 KB Created: 2021-02-21 19:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 343d7c7c1322f7af56024afbfc2a342e SHA-1: 216aec8a2799e83f4714c9c5aaa60e3d1bf90797 SHA-256: 2f26c979fefd3ad8f5a642a90c6a54d3b1dfdef1c03bfcbd36f28ab44887d804
66 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable domains and are likely part of a link farm designed to manipulate search engine results. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a phishing or scam attempt. No scripts were extracted, but the overall structure and link farm heuristic point to a malicious document.

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=hunter+springs+park+swimming PDF link annotation
    • https://cdn.sqhk.co/wojipezusax/YW7hhjf/music_ringtones_galaxy_free_download_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/pulafefer/ja3hann/assembly_line_production_examples.pdfIn PDF document text
    • http://affilateapp.online/five_nights_in_anime_25pkhs.pdfIn PDF document text
    • http://leoidet.xyz/phantompdf_express_downloadaqzz1.pdfIn PDF document text
    • http://stonersfranchise.com/80062941094spvf2.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/hiigijf/rotten_teeth_in_puppies.pdfIn PDF document text
    • https://cdn.sqhk.co/zamepeja/ia6khjH/likert_type_scale_vs_likert_scale.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/3ONgd33/mimafij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tobito/zawefadufub.pdfIn PDF document text
    • http://lezokagomidozeb.rf.gd/mr_bean_holiday_full_movie_720p.pdfIn PDF document text
    • http://jipowefata.epizy.com/runekileberifezex.pdfIn PDF document text
    • http://ratudafoxivux.rf.gd/a._r_rahman_tamil_songs_masstamilan.pdfIn PDF document text
    • http://dowisakivu.epizy.com/forex_factory_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/brown_s_nautical_almanac_2013.pdfIn PDF document text
    • http://kobuxotaregudes.rf.gd/jolly_phonics_pupil_books.pdfIn PDF document text
    • http://nirutavikuda.epizy.com/zolirepa.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_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 5224 bytes
SHA-256: 8c10376cd03aa5b91c69eee9660ec1c4ea59b1405680cbd6d632de524fe69af1
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 10476 bytes
SHA-256: 3f59c04a2af3888f1b74cd9e4cd69f7b7d0d673c684a11f94c1cf615ff7df9f5

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