Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c1fc75255d74e1…

MALICIOUS

PDF

89.4 KB Created: 2021-04-02 11:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 37099608bd3f27f5c1763f373e7f06a3 SHA-1: e95077f0ce242ccf1e40251cd14b8901bb437ac0 SHA-256: 58c1fc75255d74e14d30a29d9fe94d753e4d578c4d8aa6598b7f349fa2e4cf09
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is structured as a link farm, with many links pointing to disposable hosting, suggesting an attempt to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and numerous URLs strongly suggest it's designed to redirect users to malicious sites.

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://jacksth.ru/award?keyword=cfm56+5b+component+identification+pdf PDF link annotation
    • http://fafuzum.sportsontheweb.net/64090640654.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/binomial_expansion_questions_and_answers_a_level.pdfIn PDF document text
    • http://tuxesimufimiti.mypressonline.com/laxono.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/0rib9ie/fujuja.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/34381578614.pdfIn PDF document text
    • http://nuwetiveguvo.mypressonline.com/95446495651.pdfIn PDF document text
    • http://lupapezatuna.22web.org/elementary_behavior_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/hQMijje/chaahat_all_songs_free.pdfIn PDF document text
    • http://wwnews.site/daviwumibuput36ktt.pdfIn PDF document text
    • http://noxepometiv.iblogger.org/magakemoma.pdfIn PDF document text
    • http://hook-up.fun/blast_radius_terraformalgye.pdfIn PDF document text
    • http://kudikadip.getenjoyment.net/tuxovuzadagimetoxeteruk.pdfIn PDF document text
    • https://cdn.sqhk.co/fusuwudofal/ibG4akC/42908080928.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kutuwawelozekot.rf.gd/34557556485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964db338-922f-403b-aba3-55478af483a2/japawuvemeti.pdfIn PDF document text
    • http://kenasaxoxaxober.rf.gd/asus_z87_pro_bios_reset.pdfIn PDF document text
    • http://bibezakomi.myartsonline.com/boraf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678cd35d-b0f0-42e0-8d96-e8ec71abe4dd/best_buy_computer_repair_fees.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/57177170988.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_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 5320 bytes
SHA-256: ceac7014353732a97eb7749086960bc61766025c98ee778fedc4dfd9d58d4b54
font_01_sfnt_off00013293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13293 11704 bytes
SHA-256: 3229c7ca20be2a1e50a305e31124598b72aa14522957531073a5a7878407811f

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