Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e0ea582c98d941…

MALICIOUS

PDF

73.9 KB Created: 2021-02-17 21:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 07eaf659231a7bc0831200d0d30fd193 SHA-1: e44de5d0675f8058550ea0e095a55da333a9563d SHA-256: e8e0ea582c98d9416685eaf8b748c618a1df3318456475bec756b87b514b59a8
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 SEO-themed and point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/123?utm_term=elements+and+principles+of+design+line+definition PDF link annotation
    • http://wutigesekigaj.22web.org/ariens_st824_snowblower_parts_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/rosafipex/FjjecQq/dream_girlfriend_timid_personality.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/EhWifLB/zombie_farm_minecraft_1._16.pdfIn PDF document text
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/luliwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_600ae81ae14df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5fe7db77ee39f.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/hshdgja/princess_fun_park_and_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530036/normal_5fd8bd91713bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419206/normal_5fcdc6c3be5d0.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/kuvezagusebamewinuv.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/gezizefefififa/6425231620.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/definicion_corta_de_languidecer.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/video_calling_software_for_mobile.pdfIn PDF document text
    • http://vepuguda.rf.gd/misarob.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/letter_format_for_school_fees_concession.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/dolby_atmos_for_nokia_6._1_plus.pdfIn PDF document text
    • http://zapofekeba.rf.gd/harvard_business_school_case_study_template.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_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 5432 bytes
SHA-256: 68d42a7c2aa727c4dd7dfe74cf28425fd62dccd87370941da9507309c719bcac
font_01_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 10192 bytes
SHA-256: e0abcd4a85cfc206e2651d1f8ab0d1be98b93ad6c3be8586ab2dcfe8dc1b7ce4

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