Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7ee4261df84156…

MALICIOUS

PDF

71.0 KB Created: 2021-05-04 04:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bfd5c6392055a6d6c1506675acd25892 SHA-1: 2116b8393bfa720c98bd277e116b255be2347a18 SHA-256: 8f7ee4261df84156f68848e0f88480523508679e1877722a154b24d1ff7a1880
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable domains and known malicious redirectors. The heuristic firings indicate it is a link farm designed to direct users to malicious infrastructure, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=baixar+o+alquimista+pdf In PDF document text
    • http://pixidilivutep.medianewsonline.com/lonasufexevefemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_601dfe28dac66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387040/normal_5fdd97857412c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_603699465f66a.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/auriculoterapia_curso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465694/normal_605faef62333c.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/the_aeneid_sparknotes_book_8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fdf8e6fbef8f.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/grade_12_chemistry_textbook_mcgraw_hill.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/lanaladu/what_is_the_best_freeze_at_taco_bell.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_632f8f13c1a54740a6a35538d951a06a.pdf?index=trueIn PDF document text
    • http://fazaburifug.myartsonline.com/2010_camaro_rs_headlamp.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_9c5a3e1470bb4935b795bcf4c32f55ee.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_602e41083d0f4bbfaf3853dbd3859937.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_df5921dd82a647c3b607aff7b76b3c4b.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_44aff4681e8743d88cdc8df51f74d2d6.pdf?index=trueIn PDF document text
    • http://lakagalem.epizy.com/visual_studio_android_app_tutorial.pdfIn PDF document text
    • http://jelelonu.rf.gd/que_es_el_contexto_sociocultural.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/adjective_forming_suffixes_exercises.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_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 5432 bytes
SHA-256: 02b011469d86d1fe175a7e7bb784249a094a59a70a60b119469259d4492e4f9a
font_01_sfnt_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 13028 bytes
SHA-256: 4f1b70c2359b00630d06a1b1656901c621860cff37feac21602f94498454ac9f

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