Malicious PDF — malware analysis report

Static analysis result for SHA-256 4471e9c079d7581f…

MALICIOUS

PDF

77.0 KB Created: 2021-04-09 16:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 140fe67cfeb177ee33c8afd47198c2e4 SHA-1: 211975c897d2f30200c167954d2168ccf8efeb9b SHA-256: 4471e9c079d7581f76098af3a4195d7c4df3661c9e76c25c9f22f9558e541fa6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://nipisod.ru/strik?utm_term=how+to+scan+from+brother+printer+to+windows+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450003/normal_60052ef4cfd02.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/av7XgsB/world_sporting_events_calendar_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454982/normal_60064c8e7e945.pdfIn PDF document text
    • http://vawabipoxe.sportsontheweb.net/apache_poi_documentation.pdfIn PDF document text
    • https://cdn.sqhk.co/nadokikado/9giGjgG/77313899775.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/jjjjngh/air_traffic_control_tower_jobs.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/anti_inflammatory_diet_for_dummies.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/take_5_oil_change_mesquite_texas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366388/normal_6004911467d84.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/xylem_structure_and_the_ascent_of_sap.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/86291892514.pdfIn PDF document text
    • http://waparudadip.mywebcommunity.org/yajur_veda_sanskrit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5ff8a3429ad92.pdfIn PDF document text
    • https://cdn.sqhk.co/zixajofazadi/cnibc0E/17447926015.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/array_in_java_with_example_programs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_e03132c0e11b489fa19bc64a3ba97eb0.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_e1492dfa094141ad9a7e549f7cf7eb3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/wapuwaf.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/android_camera_app_source_code_github.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/kowufoxudumufezavaku.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_7c30ec3bc69f4abb80dbf9b59c0b7a4f.pdf?index=trueIn PDF document text
    • https://8dea6f00-b35b-4e5f-9f5e-01d9eb130a9a.filesusr.com/ugd/6a8da5_df802c53c5a14219b865c700787c8ee0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ragejufa/futinelavebanekofomat.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/97062194001.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_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 5636 bytes
SHA-256: a48799413b11d0e7155384287828cf9e8c7c4d90de1642cd5e1ce70c0a7dd2bf
font_01_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 10556 bytes
SHA-256: d1d5d23f84368505cdccf61cbbb929129a1fc5a8dc6c335d1ca96c0655599436