Malicious PDF — malware analysis report

Static analysis result for SHA-256 327992e9e1a285c2…

MALICIOUS

PDF

72.5 KB Created: 2021-03-14 01:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e4c716abef8f298f3d63af58d0e4f9a4 SHA-1: 5d545a792ae4102fd5e5bd90f71c566bf87c4f30 SHA-256: 327992e9e1a285c2791b72da56791a8ed64bae1bc9b54f189fa5ecd515fdf5d0
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests a link farm or phishing attempt. The primary IOC is the malicious URL used for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/award?keyword=analyse+swot+coca+cola+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4482645/normal_5fdc601e2e983.pdfIn PDF document text
    • http://extra-fon.ru/nuzozonajilubiwizujt03xe.pdfIn PDF document text
    • http://olivamebel.com/fujuvatobaporarusuvepem2egkc.pdfIn PDF document text
    • https://rapironid.weebly.com/uploads/1/3/1/3/131398378/bbab50263d4.pdfIn PDF document text
    • http://daravto18.ru/51281187839iph2r.pdfIn PDF document text
    • http://evromotors.net/egyptian_mythology_book_seriesj8bgh.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/88371429427.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/lurovifulirim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_6036052c05249.pdfIn PDF document text
    • http://workbykoder.xyz/tubotawesinufigafozpv52u.pdfIn PDF document text
    • http://cardioactiveufficiale.site/86323793361yz96z.pdfIn PDF document text
    • http://midakurapujif.mypressonline.com/18169517093.pdfIn PDF document text
    • http://newsportstechnology.ru/types_of_reporting_in_journalisms3wx2.pdfIn PDF document text
    • https://vavuwujaxozu.weebly.com/uploads/1/3/1/0/131070334/sevisulonukon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_9ecd0618b24042fdb6d67470504fe498.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_807badf5f67e4a6cb4cdae8c49987737.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_9c9438b683434b8bb751ab4d9db6f315.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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 5236 bytes
SHA-256: 188b68641f360f6a0ea9c253705f01f533df2a24df4ebf55d6d66e7a7775d803
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 10828 bytes
SHA-256: 123aea91c7318011e2da6612378407acf52319183edc27a606b53fbed94c0e9e

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