Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4730a5ef4f9a52e…

MALICIOUS

PDF

76.7 KB Created: 2021-03-15 16:01:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9fa23e8750b8b0036bae8573ce2cac83 SHA-1: 2eded084f1b9cac94ccd3967980f0885deb90bfd SHA-256: e4730a5ef4f9a52ee264e3170e1dfa3da36abf9340b0a10ffbded548d7f4f8d5
186 Risk Score

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 0.9995

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://vilenefex.ru/strik?utm_term=what+is+meant+by+sexual+orientation PDF link annotation
    • http://ductsunlimitedins.com/epson_1430_ink_pads_reset_utilitypu2t9.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/a_level_chemistry_past_papers.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/205483853.pdfIn PDF document text
    • http://topcreditmonitoring.info/jofuxogapifw419q.pdfIn PDF document text
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/paxeta.pdfIn PDF document text
    • http://tevituvodejifep.mywebcommunity.org/36769295536.pdfIn PDF document text
    • https://betataniboluwi.weebly.com/uploads/1/3/0/9/130969090/8491782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465388/normal_600dc66a4114b.pdfIn PDF document text
    • http://getsol.xyz/kumiweduladi8a0c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455684/normal_6005b90dcdd33.pdfIn PDF document text
    • http://smeh-mif.space/mejimiwenarikivukuxika1qwq4.pdfIn PDF document text
    • http://tevfikyuce.xyz/auld_lang_syne_piano_sheet_easy3l6av.pdfIn PDF document text
    • https://muwirejevom.weebly.com/uploads/1/3/1/8/131857435/4477826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_90c32db991c04ed8b43d3e39f835a90d.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_30d770ead19b466781894c1b3232f59c.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_a5119451e14f471aa52a83acb882b093.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_f337ed9c1a244ad88354da46c2c6ac7a.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_a56f033ee8814c09965ec767ce7bc7c8.pdf?index=trueIn PDF document text
    • http://redifigikutusoj.myartsonline.com/makalah_antisepsis.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_074cc9cf3f1242aa9e5ebfd12390f3dd.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_56c1152cd45f418c8b64a88e9f50f8f8.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_0e7f57fc44c24b1ab57dbfd248648e92.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_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 5248 bytes
SHA-256: a59fd74e2d4433baf5c125c3b6169c574d85b1cca1c8d0ef53178f7386ee3bb8
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 10820 bytes
SHA-256: 96b3456dedfcb11a479c984a2421b7d6902dd0c450f0138c4f70886b07dbabbb