Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f596639a9a132a…

MALICIOUS

PDF

75.1 KB Created: 2021-03-05 00:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2b2309783c1c97fefc38f96be7c13d0c SHA-1: 30a807dcdf6fc45445fe47086921d63c0b349830 SHA-256: 18f596639a9a132a78ee23f1d87a40d02228f8bdefd181140ad14aed5533b699
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with a critical heuristic detecting a link farm. The document body, though partially corrupted, contains text related to 'penny stocks' and is associated with numerous external URLs, many of which are unknown or lead to potentially malicious domains. The presence of external links suggests an attempt to redirect users to other sites, possibly 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://zajinet.ru/123?utm_term=which+penny+stocks+are+hot PDF link annotation
    • http://katipef.medianewsonline.com/the_ransom_of_red_chief_worksheet_answers.pdfIn PDF document text
    • http://fasoxuxesatilu.sportsontheweb.net/85128950023.pdfIn PDF document text
    • http://bitsracing.net/laliwegeziseredoxaruzec8yr1.pdfIn PDF document text
    • http://arendaavto.taxi/bamitakuwawiruguldtaap.pdfIn PDF document text
    • https://xuwajaxupix.weebly.com/uploads/1/3/1/4/131407635/nitazibadewenupeg.pdfIn PDF document text
    • http://cuzinfo.ru/zovudatibugufutosenovum4mey.pdfIn PDF document text
    • http://gnatural.space/mla_8_format_citation_exampley3bff.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/51966711907.pdfIn PDF document text
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/salejatukojexogabi.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/is_drivers_license_office_open.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/lorugipopuxe/wepitos.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/formative_and_summative_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/filter_excel_spreadsheet_based_on_list.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/90463479119.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/8203501859.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/year_3_time_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/google_drive_monthly_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/gimukak.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/twitter_apk_for_android_2._3._5.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/1720336438.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_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 5168 bytes
SHA-256: 1113a38b7de6f3faac0dde5f184017948b877158f2102e5375546d1ec382d33f
font_01_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 10660 bytes
SHA-256: 1187c1e8a2b6b1b04696731471cd43a42afbaeb35b1c73026fbc884210dcb574

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