Malicious PDF — malware analysis report

Static analysis result for SHA-256 9859036d015e8891…

MALICIOUS

PDF

76.3 KB Created: 2021-05-19 12:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 31b21f6eddd7768b2f1c6bb87dcec63a SHA-1: 75e8b01e6255c9d7acf9a2f95556f5b34e346852 SHA-256: 9859036d015e8891155d15a7ed2c46a54809eb6e0c4dcc46f63b08582d609799
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and is flagged by a ML classifier and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to a 'McDonald's menu'. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=mcdonald%2527s+menu+pdf+uk, which likely serves as a phishing or malware distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/strik?utm_term=mcdonald%2527s+menu+pdf+uk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450907/normal_5fcb3fd878245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366035/normal_5fdcdb35040fb.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/miduxor.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/deguxavar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_604fd09b353c6.pdfIn PDF document text
    • https://zudabipepapob.weebly.com/uploads/1/3/4/6/134672750/vumebosox_tetinaxi_karazejexabu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446275/normal_5fcf24f25aeb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_600eb1258065b.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/xirixepo/acls_drugs_cheat_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/gupeximavavipig.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/71090906752.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/avg_free_for_chromebook.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/nogugagezipav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a288ae7-27e7-4f75-a437-909a68ffc22f/tibudagatuwitifiguravosa.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/carifta_swimming_2019_barbados_psych_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977e5f64-f698-40e6-a0ee-3077e55e4ea3/vanutopulovutetiwevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff60529-c0ab-4eae-a0a4-50b8c043aad9/kukazerunoridit.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/caste_certificate_application_form_in_andhra_pradesh.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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 5308 bytes
SHA-256: 4b222b46b1a6cf0b3504e9e17d84829965eb137f3a9f7560b7bbc25e5a74e17c
font_01_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 12128 bytes
SHA-256: 517203e5769b9c9dadf4664ee01c3fde6fbae0249a1ba394a831b9089c25d579

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