Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dee1ffb8d1e37f5…

MALICIOUS

PDF

86.9 KB Created: 2021-03-31 21:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 424594747eb7c5cd500055ea0a55a21f SHA-1: e4af023a6971d9f147ed916ead539285b8e9251d SHA-256: 5dee1ffb8d1e37f55d9401db3c1e5dc5691f200c95b779a9ac2b7887338280e6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=summation+notation+statistics+worksheets PDF link annotation
    • http://jonotijero.medianewsonline.com/toyota_alternator_wiring_diagram.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/alberta_hunter_education_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496605/normal_6015b644209b2.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/iit_jam_2020_mathematics_syllabus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_6017d3b4813ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503525/normal_5ffdfccf293dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1df29d-4f2e-4ec8-87cc-96dc5c2f60ff/they_say_i_say_3rd_edition_chapter_3_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/xanikax.pdfIn PDF document text
    • http://bepidinotovat.rf.gd/41644984004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/511517e1-fb50-43d2-bed0-8f0e2b43f8a3/vuwadisodudijebemimugumus.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/batatosojet.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/bukkapatna_weather_report.pdfIn PDF document text
    • http://bexadujozopu.epizy.com/felalogew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e1e8ad-607a-4b56-ae38-95ed9098cff5/philips_norelco_multigroom_5000_face_head_and_body.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730da39b-b218-4efc-9023-d98938b5b542/intermediate_piano_duets_free_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f436b3c8-fa26-4591-801b-1dfc046e8237/75182700168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c38a0175-6ea3-4207-8be5-a3b725d8f776/logitech_z_2200_specs.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_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 5268 bytes
SHA-256: dfe6922b34df07a1b3451a794d0d86d8b8d6cb03141078be466e322637053417
font_01_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 12120 bytes
SHA-256: 0033929d74a9532525d0a9e2886ee8085eb8ddc17a9755d556ae7d43a2489158

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