Malicious PDF — malware analysis report

Static analysis result for SHA-256 a577308a7c00f2e2…

MALICIOUS

PDF

70.2 KB Created: 2021-01-26 09:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d50a440e91cea568992bcd2eb0689ee2 SHA-1: 93d32ffe8c7edafde6f9038fad4ede4c49566b9f SHA-256: a577308a7c00f2e28de5a9cfc9245473d7402e8ab1f130575eee260694fe071f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or distribution network for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are characteristic of phishing or malware distribution campaigns, likely initiated via spearphishing.

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://jacksth.ru/123?utm_term=nuclear+decay+worksheet+answer+key PDF link annotation
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/8581365.pdfIn PDF document text
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/2b689c.pdfIn PDF document text
    • https://vepovipozo.weebly.com/uploads/1/3/4/4/134472033/cbacbbb253a86.pdfIn PDF document text
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/bomijopopa_suxujamirus_borefopetu_vumifujoxa.pdfIn PDF document text
    • http://ver-alex.website/lightsaber_for_sale_australia3vu1a.pdfIn PDF document text
    • http://ita-yog.space/58190042047tiur3.pdfIn PDF document text
    • http://reduslimitaly-official.site/christian_movie_moms_night_outibfby.pdfIn PDF document text
    • http://afracheat6.xyz/93781847377jjcwq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/satedafadusizo/kojogegebokoxoduxepar.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/lopozifoxulafa.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/71961445853.pdfIn PDF document text
    • http://nogurinuzelajer.rf.gd/jigaf.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/google_agenda_delen_android_en_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/sojutikosopibipawit.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/pesozoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/91667020396.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/xinego.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/cash_flow_statement_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 5088 bytes
SHA-256: f9bd731fd3c930c91b87058fdea6c81c14b4571a29eaf70db73db8e4501b7878
font_01_sfnt_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 10924 bytes
SHA-256: a730ab3d118675fe148ff05e89704da85e66ff4481c9e6bc9868f51cc475d953
font_02_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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