Malicious PDF — malware analysis report

Static analysis result for SHA-256 07632f6da2a96c19…

MALICIOUS

PDF

74.7 KB Created: 2021-03-28 17:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a3e0ad89aad4f92c11a7f1ef4b224bc5 SHA-1: 4524b1b312ce3bcdb7b0d31eedf8b47d9ee3d8e2 SHA-256: 07632f6da2a96c1966600e562fcb3fb4879b5d39f310a5cf110060e84eba58e0
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one pointing to a domain associated with malware distribution. Heuristics indicate the PDF is a link farm designed to host malicious content, and ClamAV detection confirms it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to IELTS exams to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vilenefex.ru/award?keyword=ielts+official+writing+answer+sheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404299/normal_60361f309db34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_604a4d4262df3.pdfIn PDF document text
    • http://fruktovik.com/99433374246isj3s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470391/normal_600966ba9fcd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_605f2f0e079b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460709/normal_605c9cfe6db2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_604b9cc7be163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490273/normal_605653543faf4.pdfIn PDF document text
    • http://tamakar.xyz/16561483403shor5.pdfIn PDF document text
    • http://wide-mean.top/how_to_open_microsoft_access_database_engine_2010al2hk.pdfIn PDF document text
    • http://greatholl.com/letras_de_haz_llover_rompe_las_fuentes_del_cieloi05ku.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/wizuluworafid/enron_the_smartest_guys_in_the_room_movie_free_download.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_3f5ca0854a164da39cf9669fcb1a5741.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_5d351733837d44f5817b36c0626dd547.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pobixedele/regulatory_reporting_analyst_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/alfamart_philippines_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/twilight_part_5_full_movie_in_hindi_download_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/my_aadhar_card.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/kutagemifuzamimimatirifo.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_0f105aaad7534839afc1928ebd57f8e5.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_63c622a8c88e4fd494f9fe3bd8e18ab8.pdf?index=trueIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_e3ee2b888c41484a958dc00d3148deba.pdf?index=trueIn 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_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 5444 bytes
SHA-256: 99a7a4e94f0e87cc311a3dcc26dca274e1cc10651e46d20cf6716648a49da136
font_01_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 10384 bytes
SHA-256: 6385a00705db59beb02615d011f7c3cdac6af4dcf46615af0c19368b639020ba

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