Malicious PDF — malware analysis report

Static analysis result for SHA-256 a277ec57dfc6a7b9…

MALICIOUS

PDF

86.3 KB Created: 2021-02-11 15:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f908a189a14eb156aff99586c24476f5 SHA-1: 86de2d340a7aeb7c13fd7c6c3d8821b639bd0296 SHA-256: a277ec57dfc6a7b96deb165423b27cb18d6dc201976a161fc62510df5a07c62c
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URIs, with a primary focus on https://seumenha.ru/wix?keyword=someday+some+day+%25E0%25B8%2595%25E0%25B9%2588%25E0%25B8%25B2%25E0%25B8%2587, suggesting a phishing or credential harvesting attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further indicates a pattern of using disposable hosting for link farms, reinforcing the malicious intent.

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://seumenha.ru/wix?keyword=someday+some+day+%25E0%25B8%2595%25E0%25B9%2588%25E0%25B8%25B2%25E0%25B8%2587 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366335/normal_5fc918d22df39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403563/normal_5ff758ada45c0.pdfIn PDF document text
    • http://fivabigenarewo.22web.org/86146488524.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5ff0758061377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407989/normal_601761241f808.pdfIn PDF document text
    • http://mowewuwopirot.iblogger.org/al_quran_bangla_apps_apk.pdfIn PDF document text
    • http://datujizid.iblogger.org/95651668621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/73026257700.pdfIn PDF document text
    • http://buvumitibeve.rf.gd/meesaya_murukku_movie.pdfIn PDF document text
    • http://weralawubuzeg.epizy.com/badmash_video_song.pdfIn PDF document text
    • http://zitejilid.epizy.com/87721003724.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/capteur_de_temprature_lm35.pdfIn PDF document text
    • http://zosunofurokor.rf.gd/83767661618.pdfIn PDF document text
    • http://lajimaju.epizy.com/soviditugida.pdfIn PDF document text
    • http://kufuravolej.rf.gd/36645442179.pdfIn PDF document text
    • http://lugopupi.rf.gd/infective_endocarditis_prophylaxis_aha_guidelines.pdfIn PDF document text
    • http://meduzifovum.epizy.com/63264032429.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/supudumikumojenujukivesub.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 5048 bytes
SHA-256: 88b04f0db115da881a9944fcb5be38205d5e2643af14236aa6ff5d460b056fd0
font_01_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 6208 bytes
SHA-256: eeb95a64e78d20c3e9a46bab12a052dd7fa0d3df010505f54e636546c2a7e2a2
font_02_sfnt_off000125d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 10556 bytes
SHA-256: ab94ed32b76836cb3a3135b13d96a2ec6ed616b9b90bed7bcaeac8e771b931bc

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