Malicious PDF — malware analysis report

Static analysis result for SHA-256 082d02432f801e49…

MALICIOUS

PDF

89.9 KB Created: 2021-02-16 07:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 580a09cdf4c323db5f5227ad8c8226b3 SHA-1: cfbfc96efdcebf9dba14176a4e87842014b9fd42 SHA-256: 082d02432f801e490a7b3dc18ecd59cd9720df12f117ed008cdfeef56a3f281f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://yafferge.ru/wix?keyword=smash+bros+ultimate+blast-o-matic+spirit'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external links, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

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 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.
  • 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://yafferge.ru/wix?keyword=smash+bros+ultimate+blast-o-matic+spirit In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470209/normal_5feb60874312f.pdfIn PDF document text
    • http://zaroramo.22web.org/dividing_fractions_fun_worksheet.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/7983331b30f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372373/normal_5fde2f1066462.pdfIn PDF document text
    • http://lemurezagamu.iblogger.org/80534703793.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366676/normal_5fdfd44c9c5b6.pdfIn PDF document text
    • https://biwopotalar.weebly.com/uploads/1/3/1/4/131438783/xokipanamix_jupikado_tapekom_zoduxetulemeza.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/kafises/lanogatutojudum.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/tijupozadobuluwakomit.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/bitdefender_total_security_2018_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/black_and_blue_full_song.pdfIn PDF document text
    • http://nelozud.epizy.com/maternity_leave_tax_form_nj.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/what_is_the_weight_limit_for_the_harness_on_diono_radian_rxt.pdfIn PDF document text
    • http://mexowotevofo.rf.gd/wuwuzonolokutage.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/zosewojijuzufu.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/bozijinofidazomo.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/boss_2_bengali_movie_song_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/41322246750.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_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 5448 bytes
SHA-256: a1f3fde8db559e4c28b5e7ae6fad6173efa8eef3e3e797ea784dbfecaa94e0a2
font_01_sfnt_off000126e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E9 16744 bytes
SHA-256: ffc013d87b80e02c5922d3e6b4de823169bf4451751d5dc2d3a9615f694c44e8

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