Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f82633c7ae85d8…

MALICIOUS

PDF

75.2 KB Created: 2021-04-06 07:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e97081cb23cd816d699f9692fb0efcc4 SHA-1: 29e5e61c48852fa217741b7df4f08a39bb385288 SHA-256: 99f82633c7ae85d868741f97082a41c985e448cf9ee7e96abc41dce13acc5f69
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external links, many pointing to benign content but one to a suspicious domain. The PDF's metadata suggests it was generated by wkhtmltopdf, and the heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, likely for SEO manipulation or to host phishing content. While no scripts were explicitly extracted, the presence of external links and the overall structure suggest a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://ponafet.ru/strik?utm_term=30+for+30+espn+schedule PDF link annotation
    • http://nosilekexiwot.mywebcommunity.org/tulovasotajevo.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/jikeziwenopugemodonopejan.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/73379047479.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/nutritional_ergogenic_aids.pdfIn PDF document text
    • http://tobalalupuvobiv.iblogger.org/wemizo.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/xajowu/rational_functions_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/bulamadider.pdfIn PDF document text
    • http://wififeju.atwebpages.com/ribisodomelavur.pdfIn PDF document text
    • http://linuxuxotarife.rf.gd/mortal_instruments_film_series.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/string_format_python_scientific_notation.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/37735572724.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/vizarunujixapabofo.pdfIn PDF document text
    • http://ladakafojovawa.epizy.com/causative_form_exercises_british_council.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_5cfa5414315f44a2a21b5d8cb56f4c3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eedfec82-d982-499a-923e-0f4fff09a574/hamilton_beach_enameled_cast_iron_skillet_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/sheets_target_king.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/boruzezu.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/noxilaravusir.pdfIn PDF document text
    • http://rewifavad.epizy.com/16799537259.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/kadigudap.pdfIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_ab8a9b96d38d43f5a3e3aaed225c83e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mipeboro/day_end_report_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2e5b52-4544-4932-9955-858164dc9123/atomic_structure_vocabulary_worksheet_answers.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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 5244 bytes
SHA-256: 1a4d301b7a0461c4bf7a9a45f57cbff1bd788b44cf9980672124d370b64d5f8d
font_01_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 10460 bytes
SHA-256: 1918051246d13e2f0ddf4e00b7e7ebd39d700000b2ada04b9f02f26c55b3a41b

Open this report in the interactive analyzer, or submit your own file for analysis.