Malicious PDF — malware analysis report

Static analysis result for SHA-256 5880d90f918b4b68…

MALICIOUS

PDF

109.3 KB Created: 2021-03-01 08:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ed4cfde9cc4e40a3bb02e50d28e8dbf2 SHA-1: 21f070114c31b331934afa9f286f5adbad176711 SHA-256: 5880d90f918b4b68028528740d062eb817d675d6f0d92220abf455038a71e7aa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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 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://pelibifir.ru/wb?keyword=spectra%20s1%20vs%20medela%20pump%20in%20style%20max%20flow PDF link annotation
    • https://cdn.sqhk.co/pozedezupase/dUJicme/fidget_spinner_phone_charger.pdfIn PDF document text
    • http://best-store.club/roku_premiere_streaming_player28fph.pdfIn PDF document text
    • http://shopsupergood.site/63155179552ia19e.pdfIn PDF document text
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/xukonutobuxujok.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/Mgjbpib/vegan_milkshake_recipe_strawberry.pdfIn PDF document text
    • http://good-production11.site/81583698184yjg5.pdfIn PDF document text
    • http://udilische.club/konobewixiwunorajikiuluih.pdfIn PDF document text
    • http://hihikane.space/6936678622q45vi.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/39382fb83fcd456.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/dabatisew/wuvava.pdfIn PDF document text
    • http://dosunadis.epizy.com/duwojisulowu.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/peziwimafakig.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/army_national_guard_drill_pay_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/87237147998.pdfIn PDF document text
    • http://kupomegofoku.epizy.com/mavoga.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_off00016dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DAB 5780 bytes
SHA-256: f11399923d2f7b1f39d4bf9c8e5aa85026addc95ce37bedee374fec6a3597585
font_01_sfnt_off00018168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18168 11372 bytes
SHA-256: b3a989f85a7e69dbc555214e44c46a8ec0beec4568de1a37a2c585b838d69f65

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