Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf431515bd5770a4…

MALICIOUS

PDF

75.8 KB Created: 2021-05-29 04:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ed4a68edd27716db19b7173a1d105ec SHA-1: 10c9cfe9dd8ec113d28db4de357c1ff1d130fe0e SHA-256: cf431515bd5770a44ec07deef186e6cd5e091840e28ffe930665bb1058ac9087
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://kuzutuzo.ru/strik?utm_term=what+are+the+positive+impacts+of+a+cinder+cone+volcano+eruption PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458623/normal_5ff92ed80026f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_5fe631d8369ff.pdfIn PDF document text
    • https://jexopagovijum.weebly.com/uploads/1/3/7/5/137518486/bijedefi.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417413/normal_60b18e5a1bc00.pdfIn PDF document text
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/muxob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_6028ab39b6dc6.pdfIn PDF document text
    • https://jiwazakamofefuf.weebly.com/uploads/1/3/4/0/134041011/xatetoruwezo.pdfIn PDF document text
    • https://gituruledutaza.weebly.com/uploads/1/3/4/4/134401886/sonedovo-jowewajag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_60641a4eefba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_60539f2cefea8.pdfIn PDF document text
    • https://tagorawijetix.weebly.com/uploads/1/3/5/3/135392874/vifafa.pdfIn PDF document text
    • https://xobabitunebad.weebly.com/uploads/1/3/4/5/134598054/c282cbecd.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/1602488.pdfIn PDF document text
    • https://zikowipon.weebly.com/uploads/1/3/5/3/135300096/visifokasiwepuduj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5fd855b0d77c9.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/14761ba5-3695-417a-872e-95624cdb47c5/what_size_cricket_bat_do_i_need.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55f7652-19c6-4a08-b8ab-5f5ee0bd1d7b/how_to_recover_chrome_history_on_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228a0b4f-6d30-4c5f-8f70-2436c7a7b47f/howard_miller_grandfather_clock_adjust_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febb7b29-eb8b-4307-b39c-c32c751e216c/36842514775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd46ec3-cb60-4d07-bc1d-b7bf72c914c0/how_to_learn_autocad_electrical_for_free.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_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 5468 bytes
SHA-256: b04c5b465d2d50f32644cf2aa09d8439f58b2e81a22d6a6e18bddb8b45da3987
font_01_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 10332 bytes
SHA-256: e4c7035e5f4301c3d342b09e317d8799888d0d5afef2b135693450114423fad7

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