Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef0fc9ef899a3b5…

MALICIOUS

PDF

112.8 KB Created: 2021-04-17 23:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7bd47cd103c25234bb8a8ab1b0018ff1 SHA-1: a39ba9882d583c3ed7c37580739dbaa1c6256dc9 SHA-256: cef0fc9ef899a3b53959b2288868f3ef48c7a3ea4d79a651e3e0d80269b4760e
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely intended to lead the user to download further malicious content or provide sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=a+chronicle+of+a+death+foretold+characters In PDF document text
    • http://ita-talia.fun/laboratory_manual_for_introductory_chemistry_concepts_and_critical_thinking_7th_editionnfbcf.pdfIn PDF document text
    • http://kwini-fini.online/55789484782jqgrd.pdfIn PDF document text
    • http://sunukekubuwaraj.22web.org/chamberlain_universal_garage_door_opener_not_working.pdfIn PDF document text
    • http://airet.space/dead_zombie_sniper_frontier_2018_hackbtzab.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/2020_calendar_with_tamil_holidays.pdfIn PDF document text
    • http://belkwigs.com/31351750464uphqo.pdfIn PDF document text
    • http://salebox.shop/what_is_non_programmed_decisionsx1iwp.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/sofa_sepsis_criteria.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/bpsc_assistant_answer_key_2020_download.pdfIn PDF document text
    • http://firobazotu.sportsontheweb.net/69021620191.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/76460456896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feluwagosipo.rf.gd/nbc_bearing_file.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_a02513ae5d17489582943a1459e0da3f.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_c9cfa1b4d0f241e0b1665f2e0e39c75f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zijivevip/jane_austen_pride_and_prejudice_read_online_free.pdfIn PDF document text
    • http://mitotubuxabax.epizy.com/degradacion_quimica_del_suelo.pdfIn PDF document text
    • http://fobupozomorefiw.epizy.com/smtp_gmail_information.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/ccid50_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/electronic_signature_legal.pdfIn PDF document text
    • http://jatomadot.rf.gd/bach_busoni_chaconne_analysis.pdfIn PDF document text
    • http://robefopatobut.epizy.com/44355573059.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_off00017e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E4A 5100 bytes
SHA-256: 5099ff667495c1b877b3160d2a4572e5a1d92c5e7eb5738d67fe2d9b127fa430
font_01_sfnt_off00018f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F9B 11160 bytes
SHA-256: 2f78ace71e7d3c712ff9c7a8261e634f49c3a12f5c2b301b5583d90e9e7d3f21

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