Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8ce4a56d6eb8c3…

MALICIOUS

PDF

68.0 KB Created: 2021-02-07 11:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2200689190e366a8482e4b972bf3e5df SHA-1: f50c6e97b0cf67010e8fcbf8d81d08be756df798 SHA-256: ac8ce4a56d6eb8c3e1673ac69d5a507780d58ee4c242fee719d3b33ce10b228c
184 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wb?keyword=primary%20and%20secondary%20sources%20worksheet%204th%20grade'. This indicates the document is designed to lure users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded link is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=primary%20and%20secondary%20sources%20worksheet%204th%20grade In PDF document text
    • http://ruzagasaz.iblogger.org/charlie_malayalam_movie_tamilrockers._tv.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/WYOFbfK/norine.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/ggdKiyK/tiktok_followers_without_human_verification_and_survey_free.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/0QZXJUB/zonyx_game_hub.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/OjaCibT/rovapolalama.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/cihohbJ/pastimes_menu_baton_rouge.pdfIn PDF document text
    • http://lanufutado.22web.org/83128219258.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/jebupofedijakuk/zopigexekirirakawasuwepol.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/add_google_button_android.pdfIn PDF document text
    • http://suniwuvujibo.epizy.com/rulux.pdfIn PDF document text
    • http://gisatazab.rf.gd/vivija.pdfIn PDF document text
    • http://wusozugidiwe.rf.gd/zexijoxiwuduwox.pdfIn PDF document text
    • http://wigamewekafon.rf.gd/wanirumupul.pdfIn PDF document text
    • http://peworesafasar.epizy.com/8137659594.pdfIn PDF document text
    • http://pagupim.epizy.com/8090992674.pdfIn PDF document text
    • http://zozezad.epizy.com/wezusomitapezagalikes.pdfIn PDF document text
    • http://sezulezaba.rf.gd/latipiruwonanofu.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_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 5668 bytes
SHA-256: b5c1ba689b7a7599ade4c2454930301365305b567ee97c7128088408b9bbd684
font_01_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 10604 bytes
SHA-256: ed500b61c197d818774d48d4589edd97be45d0478454d939a6c890c293541c47

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