Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a64b1c045a98fd…

MALICIOUS

PDF

79.1 KB Created: 2021-06-14 04:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a107300836231c5813fce1e224ab2cec SHA-1: ee219a1d72e8515c775528f28758aa20c87013ba SHA-256: 50a64b1c045a98fd70c71fa4a287d2144cfd234370492dee53768b28c40b9db9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://garglob.ru/pbw?utm_term=medical+certificate+format+in+word PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4527345/normal_5ff35a1289989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448545/normal_60622568a62bb.pdfIn PDF document text
    • https://kizufujuzuvajet.weebly.com/uploads/1/3/5/3/135316206/d2fd09add3d273.pdfIn PDF document text
    • https://kudokazapa.weebly.com/uploads/1/3/1/4/131452939/pejivenoba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5fe1161f9587a.pdfIn PDF document text
    • https://pevetogebika.weebly.com/uploads/1/3/5/3/135335423/fikevegud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_6016ec21b3922.pdfIn PDF document text
    • https://baxegirugono.weebly.com/uploads/1/3/5/3/135319521/vosawivitamis-wugubasifax-subafagujom-gelis.pdfIn PDF document text
    • https://xemaxokiba.weebly.com/uploads/1/3/4/3/134350412/dutujujusezijeb-belalawitar-tufexi-denab.pdfIn PDF document text
    • https://zaxifugerabapaz.weebly.com/uploads/1/3/1/0/131071175/5766631.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/5725561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_606806aad0e83.pdfIn PDF document text
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/ruxusulabexiti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_6052840c8145a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_60c5465949981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_60c24b45093d7.pdfIn PDF document text
    • https://nudomituge.weebly.com/uploads/1/3/4/6/134677479/zokujipu_rolamiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/558a60c5-1dcc-4a80-8f71-c67149c79566/71520098582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c924c7a-1ee0-4684-829d-a126bd90a7d8/panasonic_kx-t7633_change_time.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_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 5088 bytes
SHA-256: b10544f160b40c9269ce919da8e562f1fb1f38de2eb985b4f6c1be7cfc08b26a
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 11020 bytes
SHA-256: 493df1f19cc52563d5f7671bcf49b67d1b45392a95ffb161e32cd05848ec7d40

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