Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f99baeb50dd7788…

MALICIOUS

PDF

94.5 KB Created: 2021-03-09 04:34:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 42489d462677f516605ff1640645a22d SHA-1: ee1e055ae05eccb2c6147746cb013ac32e3624af SHA-256: 3f99baeb50dd7788ab747199baa59210f4a36c64a37ac59ed07ee2d89fb1e813
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/award?keyword=reglas+del+basquetbol+pdf+2020 PDF link annotation
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/624722.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/T6Yibii/gameboy_micro_for_sale.pdfIn PDF document text
    • http://hookup154.online/pelofanoehtlv.pdfIn PDF document text
    • http://carishr.com/78061011119ymmvc.pdfIn PDF document text
    • http://itwow.info/divine_comedy_purgatoriot8n6r.pdfIn PDF document text
    • https://nodarato.weebly.com/uploads/1/3/4/4/134487471/nomufes_manituta.pdfIn PDF document text
    • http://tublitalia.fun/rewogiwomuzetukajap50na.pdfIn PDF document text
    • https://bekodezu.weebly.com/uploads/1/3/1/8/131856725/74a0229bb8e3.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/lupawufixagojojojal6am4j.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/g5hjGji/battle_angel_alita_last_order_omnibus_6.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/hdPjcd5/12066360720.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/kPicjb1/jomol.pdfIn PDF document text
    • http://snail-case.store/36255086438qv5va.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/0gsIgc1/31848505912.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/tirimofufemukat/cerebellum_structure_and_function.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_fca7579147ab4006bbdf42d70c5b604e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gomakobez/kant_what_is_enlightenment_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/sogaz.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_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 5660 bytes
SHA-256: fbb1571eb23c3e1932cc343fc894dadb7d8053a50664d45ccbe6ac3328839b15
font_01_sfnt_off000136bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 4272 bytes
SHA-256: ba22b46157a991826f42df1086683e9697fe9d5070eba8371220c2bfca0eaff1
font_02_sfnt_off00014664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14664 11808 bytes
SHA-256: e78b1339a14bed1767740c759ca6088158fe3fe97e154bbd7b8b5c772acfbd27

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