Malicious PDF — malware analysis report

Static analysis result for SHA-256 3845713e4b3da50f…

MALICIOUS

PDF

69.8 KB Created: 2021-02-12 07:07:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7842cdfc7f2b29f7336b92786fdcf219 SHA-1: 0172088bad00bef67656005f00ee2d9b1d1bd9a8 SHA-256: 3845713e4b3da50ff50ba110aa1beae32081b80c40fda594e4368604bb9c0b8b
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wb?keyword=how%20to%20make%20a%20worksheet%20for%20students PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412195/normal_5ff8285bc9244.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/xinobuguja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_601bfb6f0f76b.pdfIn PDF document text
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/8adcefc5bc065.pdfIn PDF document text
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/414d1ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_601f02c9b458c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388608/normal_600319d442efd.pdfIn PDF document text
    • https://gosevitugelaw.weebly.com/uploads/1/3/4/4/134439416/9682100.pdfIn PDF document text
    • http://boxberry-24.cc/lowiwidatetinutubawixagaxygqyh.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/1097150.pdfIn PDF document text
    • http://design-kvartira.info/waludeturav1yu5.pdfIn PDF document text
    • http://winwites.space/bilateral_agreement_template7r7zv.pdfIn PDF document text
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/4195800.pdfIn PDF document text
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/35ce8d.pdfIn PDF document text
    • http://kiruvoxexuk.iblogger.org/google_ads_mobile_certification_answers.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/xasomegamas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/komitadenapir.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/cartoon_movie_videos_songs.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_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 5232 bytes
SHA-256: 1e84c8323d05e6ba84305e0ad43d8570430ae10ec878cd4c128e6a0bddb63143
font_01_sfnt_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 10340 bytes
SHA-256: f1ed845ec2b37c23100e1e955ba540d01ebe83d5b1d5bd78d85f582f3953661f

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