Malicious PDF — malware analysis report

Static analysis result for SHA-256 7772807405663428…

MALICIOUS

PDF

84.0 KB Created: 2021-03-22 12:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7cc65280af1c5514403f5627256b47ba SHA-1: 2eff49ee27798f0292162335deec3b9461eb0512 SHA-256: 77728074056634281e6e46362de69a9184a8452c0213a3100be52a608d828df9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains numerous external URIs, many pointing to disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a title related to 'Sociological theories of poverty pdf', suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/123?utm_term=sociological+theories+of+poverty+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481665/normal_60470bc119c03.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/vutivew.pdfIn PDF document text
    • http://devubowoku.mypressonline.com/76600479796.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446765/normal_5fcd0a679ddab.pdfIn PDF document text
    • http://ayazshabutdinov.club/burning_rash_on_legs_after_walking6svyv.pdfIn PDF document text
    • http://tilosag.mypressonline.com/adrenal_fatigue_the_21st_century_stress_syndrome_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374518/normal_5fe3dc805bc9c.pdfIn PDF document text
    • http://net-klientov.ru/vaviluzatozenipepadakow8333.pdfIn PDF document text
    • http://vixegoxufareka.getenjoyment.net/dipedug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451230/normal_5fd9e9e32a575.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/29181626904.pdfIn PDF document text
    • http://jokegave.mywebcommunity.org/dogelad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_602d284fe2f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457572/normal_6010045e27f1e.pdfIn PDF document text
    • http://azorocheat6.xyz/pubivaniwvc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bebovufuvuji.myartsonline.com/fotatopemitogaredukaziw.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/microsoft_antivirus_software_free_for_pc.pdfIn PDF document text
    • http://fazatela.myartsonline.com/18366491824.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/bukodefolezugi.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/rojawu.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/kivaxuwiduxufibi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 5684 bytes
SHA-256: d475b1151f1c50cf724499398376c3c3c991e5f36b6e367956c39626aa23bfec
font_01_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 11148 bytes
SHA-256: eac25bc63b6dd1730b7e1ea951a5382858589c5a1e6579afedba46f3002407a7

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