Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cdab5d34fe753b…

MALICIOUS

PDF

80.1 KB Created: 2021-02-17 15:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 416721cda5b4e6b1f8fb461aaaea1013 SHA-1: 837c41996e1e5c37c780fb57880c446594315c3c SHA-256: 75cdab5d34fe753b5ec16e38725ac120be5f6d6ee098c73b1c04c3e251198705
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the ML classification strongly indicate a phishing or malware distribution attempt.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=avent+sterilizer+microwave+vs+electric PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460060/normal_5fd60d6f7a830.pdfIn PDF document text
    • http://leree6.club/luton_and_dunstable_hospital_cqc_report_20165usjs.pdfIn PDF document text
    • http://devgame.design/122569887975ivpl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446035/normal_5fe5723453dc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5fcc3ce2d5f4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_5fd3a28d6e336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_5fe7a36b6e4dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450889/normal_600723c7477be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_602b798632ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370547/normal_5fddf522df192.pdfIn PDF document text
    • http://choosemadam.site/dimensional_analysis_worksheet_keyt6q03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_602cf4fddfeb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5fe41ee75d4e7.pdfIn PDF document text
    • http://vekvelo.ru/zuduru49l40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476273/normal_600603b262ec0.pdfIn PDF document text
    • http://birjand.design/gajisodogalakife7mxxh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukasutatota.rf.gd/19144453258.pdfIn PDF document text
    • http://wadekazu.epizy.com/x_and_y_intercept_worksheet_day_3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 5136 bytes
SHA-256: 7b7416a226a038ba5fa7ec5846b9909e54babe57d66d55f80ca71ab92515699a
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 2112 bytes
SHA-256: 3f1c3eb2424b428ad6f1e025c5dfe63e6d93d7008eaa1a95c3cfc3b37f913294
font_02_sfnt_off00010d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 11104 bytes
SHA-256: 24615655ae8b41ca5d5cf3f707f1330a03c86da98e98f42be9a585694773755c

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