Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef4a4560b0be549…

MALICIOUS

PDF

96.1 KB Created: 2021-04-30 03:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 81c4278c8e6e817c9e5b0af7ba3b68b7 SHA-1: 6f825acc8b6d6db57c3d4e19dd08307d96c65d3a SHA-256: 3ef4a4560b0be5496d5d7229cf3b7a1d07b34074ab0ee03f86440245cac2aea1
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing or redirection attempt. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain search-like query terms, suggesting a lure to external content. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing attack.

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://crophysi.ru/strik?utm_term=what+does+deviant+in+sociology+mean In PDF document text
    • https://kekisuganuzab.weebly.com/uploads/1/3/4/7/134721312/3198392.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/karetat.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/jogavepu.pdfIn PDF document text
    • http://nijowefipegivu.iblogger.org/66337009060.pdfIn PDF document text
    • http://bunagutafa.getenjoyment.net/33000894071.pdfIn PDF document text
    • http://liniwugo.iblogger.org/asthma_guidelines_2020.pdfIn PDF document text
    • http://gidujepeparu.22web.org/the_wheel_of_time_amazon_books.pdfIn PDF document text
    • https://mijekuwovosi.weebly.com/uploads/1/3/4/3/134321571/womeja.pdfIn PDF document text
    • https://bixibifitiki.weebly.com/uploads/1/3/5/3/135316299/31a6f1dec9fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vufuditot.rf.gd/kipugojazaz.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/what_is_an_ecosystem_biology_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc690da-6ab4-4e32-943b-f0a0766826c5/scag_v_ride_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/61715003093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90dcf842-64d4-4912-8f80-f0a7e47cb78b/29812172723.pdfIn PDF document text
    • http://jawikaginixuxuz.rf.gd/automotive_repair_order_template.pdfIn PDF document text
    • http://wekazuvenasiwuf.epizy.com/82812940617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435433a4-7661-4ff5-ba28-cb8c163ddc42/how_to_make_basic_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e7a7f6-b5f8-4881-b139-8fc9c7fc6bdf/gluten_free_dairy_free_junk_food.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/jewel_chicken_wings_nutrition_information.pdfIn PDF document text
    • http://mirimanomuropa.rf.gd/43453664345.pdfIn PDF document text
    • http://taruligewonuna.rf.gd/18441669665.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_off00013b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0B 5432 bytes
SHA-256: 8e263f6ebd906080a618d07da25894bcc3720fd06217ca504057d7bcb12a9fcc
font_01_sfnt_off00014d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7D 11388 bytes
SHA-256: e8bdf0dd0b85605aa9a4706a57011b6e46e9ed30719e4e0a425b06ba0ef1f9d0

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