Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f40033455fe03af…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 16:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a81e0e150a3c6f8d8e83f2e1ba2d9a11 SHA-1: d5e0dd61664b5b1e400b3b588b69bce5bb24d893 SHA-256: 3f40033455fe03af1aabfe827dceee5bec2ba73e1d4323f44627c17296c7c47b
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary link leads to a URL that appears to be a phishing lure related to defamation of character lawsuits. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=can+you+sue+defamation+of+character In PDF document text
    • https://static.s123-cdn-static.com/uploads/4446930/normal_5fc84379e5ece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_60155d02de063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457876/normal_5fd79eb50b4bc.pdfIn PDF document text
    • https://xegunato.weebly.com/uploads/1/3/4/3/134315925/lubezanifotuz.pdfIn PDF document text
    • https://pogupevupawigo.weebly.com/uploads/1/3/5/2/135293313/tagafija.pdfIn PDF document text
    • http://robolab.one/connectify_hotspot_pro_2016_full_crack0q0kj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485580/normal_60017c1e0f633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5feb8905cead6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5feb0992b8a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_6039470ed46e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_604cf17fc5831.pdfIn PDF document text
    • http://zudepogumo.medianewsonline.com/guduvizixamusilijuzojar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_6031636150c0f.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/8906734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_5fd18562ac20a.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/bovago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482403/normal_5fe68b19d8c47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_60531c6e2442d.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/59943943166.pdfIn PDF document text
    • http://hookup754.fun/vadajitnet2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fd0a7c68d5fe.pdfIn PDF document text
    • http://help-igcopyright.xyz/ver_persepolis_espanolevasv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_5fc5f53d941c0.pdfIn PDF document text
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/70d87416a5d6681.pdfIn PDF document text
    • https://muzuxagofonokow.weebly.com/uploads/1/3/1/4/131406885/1641144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_605127f66f656.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/92846458169.pdfIn PDF document text
    • http://milesatel.mygamesonline.org/angina_bullosa_haemorrhagica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 5236 bytes
SHA-256: 1dd7343631b70a4421346f2e6eb7c90ebe10b0acf56661967fbf2c2f33d1db43
font_01_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 11056 bytes
SHA-256: 227b71cbf84cbfe1ffcb5f1417835419b0545475087ec9bd67b39ec7de5c377f