Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c76999d8580a941…

MALICIOUS

PDF

74.4 KB Created: 2021-02-21 23:34:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 52aab81a34f95d8393dce5930a4e526f SHA-1: b0100e559d5e1bb9043fbbd21436b52897c2b941 SHA-256: 5c76999d8580a941bba4f1747c2d9e9f85d161c970210b0310ebf4dbcadf958f
166 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged as a payment redirection lure, indicating an attempt to deceive users into changing payment instructions. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous external links, including one to 'maypoin.ru', points towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://maypoin.ru/123?utm_term=complementary+and+supplementary+angles+worksheet+grade+6 PDF link annotation
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/93a74a841c.pdfIn PDF document text
    • https://zidadosivifaju.weebly.com/uploads/1/3/0/7/130775619/7111c80.pdfIn PDF document text
    • https://gilepinewuje.weebly.com/uploads/1/3/4/0/134096317/dexuwofako.pdfIn PDF document text
    • https://xakowuval.weebly.com/uploads/1/3/5/3/135316831/sesilogo.pdfIn PDF document text
    • http://vaxunugaso.22web.org/79090627519.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/0286d47cbad096.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/359531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413117/normal_600790b8cda47.pdfIn PDF document text
    • https://kebonipima.weebly.com/uploads/1/3/0/7/130740513/4050887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5fe7067270ebd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489992/normal_5fee460fa8c4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5ff16a2055d9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duzixaludu.rf.gd/39953871369.pdfIn PDF document text
    • http://rigamijuzekup.rf.gd/dios_mios_booter_r30.pdfIn PDF document text
    • http://loxazugexola.epizy.com/brackets_software_for_pc_free.pdfIn PDF document text
    • http://pudubekij.epizy.com/fmla_attendance_tracking_sheet.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_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 5692 bytes
SHA-256: ba5c6c1dfd3ae2b03ece11ff7feaedba55e82dbcf43b0a11944aa3d33b33412d
font_01_sfnt_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 10740 bytes
SHA-256: 3d0740f988e0f44c241b3174f5263bb55f33e86ff6df613f4f00ac2c617b0d16

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