Malicious PDF — malware analysis report

Static analysis result for SHA-256 97784acd1c9f9f86…

MALICIOUS

PDF

75.7 KB Created: 2021-03-08 01:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7dbbaeb13a8663c38941471ae4f3281d SHA-1: 79e709b0d7e1d74b70c508928b87a4e1d1fb7173 SHA-256: 97784acd1c9f9f86fb65148811910ab51a79ce123c283ce451c016250abff496
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload 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 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://maypoin.ru/wix?keyword=bill+nye+potential+and+kinetic+energy+worksheet+answers PDF link annotation
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/1013429.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495254/normal_5feddca28d8a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_6023ed1a84a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_601bad025558e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381531/normal_5feba164b580a.pdfIn PDF document text
    • https://voxisazemiruza.weebly.com/uploads/1/3/1/8/131871554/790fa82b.pdfIn PDF document text
    • http://vehicleinsusa.com/242174052111djwd.pdfIn PDF document text
    • http://itsnat.space/48468800705cgvx2.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/2e30595.pdfIn PDF document text
    • https://mumotajesok.weebly.com/uploads/1/3/0/7/130738730/a540e9f.pdfIn PDF document text
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/dulekoda-pidawulan-rerufu.pdfIn PDF document text
    • http://milansit.space/19437635733a7v94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416787/normal_6008959b940d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_66ddd6a28260425a82c9516d40cd8e90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/cartoon_christmas_flute_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/income_tax_calculation_sheet_2019-_20.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/abcd_movie_mp4.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_43ac84f8922e4b5393337fbdc3069a26.pdf?index=trueIn 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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 5644 bytes
SHA-256: a3a86f080153d1562c6b70cd6e31ad56d699a910b1c9b1ceac4040a1122506ac
font_01_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 11576 bytes
SHA-256: e63c8d380788c6af49652cca37ef9619470090948afde915b93316d7a47dc3bf

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