Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28974cb37e430c9…

MALICIOUS

PDF

78.5 KB Created: 2021-05-06 04:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: adf1d7194d2aac3be61dafe35b69af38 SHA-1: f80299e9a3231067877710b614c007efa6715155 SHA-256: e28974cb37e430c9cb08d9a701159ad30a70d237284b1c6939576b33308893df
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URL, https://vilenefex.ru/strik, is likely intended to host phishing content or malware. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further infection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=100+a%25C3%25B1os+de+soledad+frases PDF link annotation
    • http://waferaboteb.mypressonline.com/3022401794.pdfIn PDF document text
    • http://kitazixozakabu.sportsontheweb.net/63854554674.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/65998808193.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/29622018592.pdfIn PDF document text
    • http://jovekigapovokeb.22web.org/the_game_1997_movie_free_download.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/runagugelop.pdfIn PDF document text
    • https://sugovodeko.weebly.com/uploads/1/3/2/6/132681033/xitasar_zikaworaw.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/bbc_compacta_class_11_english_answers.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/munuba.pdfIn PDF document text
    • https://nagozexifetuli.weebly.com/uploads/1/3/4/3/134340384/981a2712ba81.pdfIn PDF document text
    • https://daxixulo.weebly.com/uploads/1/3/1/0/131070202/2538961.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/90204652980.pdfIn PDF document text
    • https://jerezuwiwufuken.weebly.com/uploads/1/3/4/3/134355676/99f34.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/wanasuvedigo/30027678119.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/text_structure_worksheets_for_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/bengals_2019_schedule.pdfIn PDF document text
    • http://gawivofeb.epizy.com/facebook_video_hd_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/advanced_trainer_second_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/89024558111.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/18437455665.pdfIn PDF document text
    • http://suvemavukefejig.epizy.com/56838593209.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/24567060294.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/how_do_you_know_if_youre_above_average_looking.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/curriculum_vitae_example_download.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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 5212 bytes
SHA-256: 1d64a1f90989c14914fa85aa5fc9c82ac0c0a8995cddcde190a4f799b03ebd4f
font_01_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 11896 bytes
SHA-256: 656e8896487a301a7ac77d3baf175bdef720fc80c86d18af026fb7acafcd3bde

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