Malicious PDF — malware analysis report

Static analysis result for SHA-256 528dbbead0eb1e4e…

MALICIOUS

PDF

75.0 KB Created: 2021-02-15 09:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c0a7e62628a92480bf55356249db9f9f SHA-1: 6f49803e3a26d2b57954131a75c3d319bf881541 SHA-256: 528dbbead0eb1e4e719224a7974ccc05d9ce046960e81810995d25eff710b1e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or use link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malicious PDF. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=crossword+mysteries+episode+1+cast PDF link annotation
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/jodudobakoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_5fdb89a9326e4.pdfIn PDF document text
    • http://pusaburuku.22web.org/volume_of_rectangular_prism_quiz.pdfIn PDF document text
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/d6ecd9ca93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377403/normal_5fc5db8f87ff7.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/bobadexikataligegan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_5fd1e84e0ea28.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/8125566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5fd0e62e84cbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigufapaw.epizy.com/jukejijukaxasozepabu.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/metukugedujoratulepo.pdfIn PDF document text
    • http://mobuloremade.rf.gd/my_airtime_app.pdfIn PDF document text
    • http://zizumanoxiv.epizy.com/sample_biology_lab_report_on_enzymes.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/2010_camaro_ss_manual_top_speed.pdfIn PDF document text
    • http://vofiwevo.epizy.com/guiders_academy_placements.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/mac_reduce_file_size_quartz_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/chutki_bajana_chod_de_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/44387893832.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/everyday_mathematics_grade_6_home_links_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/tamil_play_movies_2019_full_movie.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_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 5336 bytes
SHA-256: de9e851b59a414af9161706189b107cb186f796e944df8952f16efced93c7d1e
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 10804 bytes
SHA-256: c0f9c94676df9c3c06c1e71a7383a18faeeec29287708b74898a56440b88b879

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