Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a38583f6fa01e81…

MALICIOUS

PDF

89.0 KB Created: 2021-05-23 22:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53a7a83257166ee3d718c55b390d31e0 SHA-1: 825d4b38854b69444d87380aabbb5ac2b800f6a6 SHA-256: 7a38583f6fa01e816e0e7322a2e16ca69578d07f51e4f8573bb2bcbe2d92010d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://dafemum.ru/strik?utm_term=basic+principles+of+classical+ballet+free+download PDF link annotation
    • https://zeduxuvanoripi.weebly.com/uploads/1/3/0/7/130775880/nupix-koxedifiketonox-lokumutiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_601976484cf6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_6065dd4013a7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_5fdc20e0395bc.pdfIn PDF document text
    • https://bomutakarekavag.weebly.com/uploads/1/3/5/3/135330682/0aa199c0c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384301/normal_5fdf33e6d39a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453142/normal_5ffe7e47ad2df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_6026eb2c49765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_600ba8d1de80d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_6026df40423c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_6047be7643646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_600fe9186280a.pdfIn PDF document text
    • https://jinajifija.weebly.com/uploads/1/3/4/8/134889339/gewulasav.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/nitizobuv/juvesa.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/23485866228.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/tejejala.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/icsee_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/leasehold_advisory_service_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/78036805292.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/xaxabik.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/how_to_turn_on_a_jacuzzi_whirlpool_tub.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/bufubotavonosopemot.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/major_depressive_disorder_treatment_guidelines_in_japan.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/beyonce_live_formation_tour.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_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 5220 bytes
SHA-256: e3bbb3a10fdd1f7375bbc2f72d6c96de8ccfae52fabf03d40ac8a47729564d6e
font_01_sfnt_off000123bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BD 10712 bytes
SHA-256: 9c62afe58d1ccbcf4208e3273cb6d022bbc5b91cb04cfe63ec1a23a17e41c47b
font_02_sfnt_off0001481c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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