Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df22c6409f4097f…

MALICIOUS

PDF

105.4 KB Created: 2021-03-15 05:28:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0c5f771295e98daf45c810629a92c82e SHA-1: d98db78f6352654f258ea803cefab7e2597e8db2 SHA-256: 0df22c6409f4097f53fa24d4ecfc190d55d726be116562d6d8201b2e4cc34ae7
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the document with high confidence. The document body, though heavily obfuscated, suggests a lure related to 'absenteeism and presenteeism', likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crophysi.ru/award?keyword=absenteeism+and+presenteeism+pdf In PDF document text
    • http://fegiroxopirez.sportsontheweb.net/gafiwinejepumifukisupeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_6021c10404046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375700/normal_5feb8f521763b.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/67429913645.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/larisunajumuxiwakipado.pdfIn PDF document text
    • http://pegijegur.mygamesonline.org/woselapetipifuwefixuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460477/normal_5fe3c840960e4.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/balanceamento_de_reaes_qumicas.pdfIn PDF document text
    • http://vomidujoma.scienceontheweb.net/what_are_the_5_categories_of_journalism.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxepivol.myartsonline.com/33156798161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032b95a0-d5dd-49e1-b6ee-9539ab906691/python_for_loop_increment_index_inside_loop.pdfIn PDF document text
    • http://fozozip.onlinewebshop.net/41621581593.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/52365563640.pdfIn PDF document text
    • http://tevesuxaxil.rf.gd/xasopirilumoxelowamaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47cef9a6-3455-4c5c-a0af-d650add9623a/volvo_penta_duo_prop_outdrive_parts_diagram.pdfIn PDF document text
    • http://veraliw.rf.gd/gojejuxenajezixewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d03e20-730b-4fbc-ba29-91fd2f0bd6bb/what_is_survival_of_the_fittest_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/52901038177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b94ddbb-131f-4e25-a750-faac39ec5bdb/nozulezixisubuzexurose.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/vijulovuvafajexog.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/4325681515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c8c287-8719-431b-9ea2-4c85c7e68eb2/does_salvation_army_bell_ringers_get_paid.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/millers_falls_miter_box_74.pdfIn PDF document text
    • http://zijedan.atwebpages.com/digixejemoto.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_off00015d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5F 5284 bytes
SHA-256: 48fa1624fc4a050e8531d763374b203374a151b5ee2b32cd69b6d6a94fbd9b08
font_01_sfnt_off00016f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F36 11352 bytes
SHA-256: 2dfcc05878c908bc2c87a1d5ec47fbb427ae694275835500077a7472b9c7f80d