Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3792f7593ff2e89…

MALICIOUS

PDF

73.2 KB Created: 2021-02-28 19:38:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 36c4d420e80dcd3883eac495cad55fe0 SHA-1: 150a7ec3adf50e9a0775ed87a00e02bf7d52d7c8 SHA-256: d3792f7593ff2e89a9b08123949f6410902396f40e661eef28a7528f7a78d8a5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jumiwimov.ru/wix?keyword=difficult+conversations+pdf+harvard PDF link annotation
    • http://sehq.xyz/black_platform_heels_strappyg2yvt.pdfIn PDF document text
    • http://monoga.space/kimalicyhek.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/dnlhbgi/74109262627.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/49060381866.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/8IpD7XN/numeluzakofetojik.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/gepenhe0sl.pdfIn PDF document text
    • http://bufo.online/commendation_letterrg7j3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5fc93f5e36368.pdfIn PDF document text
    • http://blablablacar.online/86594041359nrbw6.pdfIn PDF document text
    • http://mjawebdesign.net/93138409228c5euk.pdfIn PDF document text
    • http://klossheff.xyz/54870349192np90d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nakeviw.myartsonline.com/89165659755.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/30418882367.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/does_your_face_get_flushed_in_early_pregnancy.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_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 5304 bytes
SHA-256: 4e4deb2bc3a8db2ab92808c0238150695b47bc6efc9dce3ef054fbc49f302d2c
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 10192 bytes
SHA-256: 2ba525047a8918fd1d372f9057f19b87495ba2e8ffc8119f9ed605775a10cee5

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