Malicious PDF — malware analysis report

Static analysis result for SHA-256 b747f0790d82932a…

MALICIOUS

PDF

81.0 KB Created: 2021-04-15 17:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4ededeebd1d111278d6c8520cb06d162 SHA-1: c2dbe5f0e1f5af3a6d05cb12532ad0e03eb75180 SHA-256: b747f0790d82932a10068ffbf7bf9ce14b965b26dbdd603d2420c5600d0cda4a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Cfa level 1 exam prep materials', suggesting a lure to disguise the malicious links.

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://dafemum.ru/strik?utm_term=cfa+level+1+exam+prep+materials In PDF document text
    • http://kiwufaninini.22web.org/69792541082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_605ff57b07549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_6047297ee4d57.pdfIn PDF document text
    • http://getfreecreditreport.info/40281423417xqklq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_603ac48275283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_603f516f4c9ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_605948c5eb3fd.pdfIn PDF document text
    • http://figironeme.22web.org/tiwokidus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_6055acfb9a301.pdfIn PDF document text
    • http://difuwikikum.iblogger.org/alaris_s2020_scan_to.pdfIn PDF document text
    • http://kpovli.ru/bhagwat_geeta_in_hindi_chapter_13lkyff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://katudajug.epizy.com/natozikamara.pdfIn PDF document text
    • http://zixugikel.rf.gd/microsoft_project_free_download_32_bit_trial.pdfIn PDF document text
    • http://vowatutijetig.rf.gd/options_futures_and_other_derivatives_solutions_manual_10th_edition.pdfIn PDF document text
    • http://jowuwivipi.rf.gd/air_circuit_breaker_mitsubishi.pdfIn PDF document text
    • http://vavuzudimolig.rf.gd/rumozipenararez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 4824 bytes
SHA-256: d8ff2453272a34354ebcdcb5979bdc4c78e0628a933b0cd10b14f3b5b89e7739
font_01_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 11760 bytes
SHA-256: c0d576cec6e14a166a3a10111812ae3723668c24c0ff05d5b2a645bab19dcadb
font_02_sfnt_off00012792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12792 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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