Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8be5989bc489d9…

MALICIOUS

PDF

77.2 KB Created: 2021-02-25 08:16:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 81fbb5a46a19d1e4ca10dca8f4f59e7d SHA-1: 2adf15690a7baad49c4c4d0eeb5c85a0a4ef7152 SHA-256: 5e8be5989bc489d904e2e4349cde54732196d46d9af3d948eb8dfe4f2943ae58
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document is designed to redirect users to malicious sites.

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://bologen.ru/strik?utm_term=a+levels+chemistry+syllabus+2021 PDF link annotation
    • http://okrasote.info/jamunamironugulinoo903y.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/9741472.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/xawexufulatejosi.pdfIn PDF document text
    • http://ketosimple.online/reported_speech_in_spanish_exercisescjik9.pdfIn PDF document text
    • http://sun-italy.space/fazuxusafijw9.pdfIn PDF document text
    • http://soldatskaya6.ru/545877316314dv3.pdfIn PDF document text
    • http://car-den.ru/que_es_una_parabola_de_jesus_para_nioswvam8.pdfIn PDF document text
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/guzadijamif.pdfIn PDF document text
    • http://auto-agents.space/greenhouse_effect_assignmentuub6p.pdfIn PDF document text
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/lademitegij_vinenofir_wulegojomere_bitegixagija.pdfIn PDF document text
    • https://lomabeguj.weebly.com/uploads/1/3/2/6/132695586/6062bb1e.pdfIn PDF document text
    • http://axacheat4.xyz/53486514035xovv8.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/9e9c7f1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofaxafogi.myartsonline.com/94606459754.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/video_player_app_for_android_2._3.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/jufiterodexekavi.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/16140664828.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/tetov.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_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 5656 bytes
SHA-256: 7f6254ffa9142464a0d3422d7d426e39903f95fa092e1945babc52db5b6818a8
font_01_sfnt_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 10880 bytes
SHA-256: 74c3141e0cbcc0877aa2087fe038c4168b7bde27cdad5781929b2a73ce9df4a4

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