Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d0e3c7c94502f2…

MALICIOUS

PDF

70.7 KB Created: 2021-02-24 00:22:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: ad46021d4872ece793f5664b9a047647 SHA-1: d1b036c952ce84ca8fda6407842a54030220a96c SHA-256: a4d0e3c7c94502f2cd9af4e4431fe32e6ab19e3f387fb3bef7168874323138ca
244 Risk Score

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
  • 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/wix?keyword=1st+grade+end+of+year+math+assessment+common+core In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_6017a67e12399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_5fe9d0212fe0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_6031008f9516a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411696/normal_5ff1d1ce2f1ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd69dc5d5dcc.pdfIn PDF document text
    • https://dijovenop.weebly.com/uploads/1/3/4/7/134705939/83d242f28b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487423/normal_60134b999ef9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5ff541635f8e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5fff5d3105b92.pdfIn PDF document text
    • https://pigulanofalo.weebly.com/uploads/1/3/1/4/131406379/64b3673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385207/normal_5fcabb93a0b57.pdfIn PDF document text
    • https://vusukiziroge.weebly.com/uploads/1/3/0/9/130969505/rugekaxak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kexobub.rf.gd/mogibo.pdfIn PDF document text
    • http://fanofajuduma.rf.gd/lowima.pdfIn PDF document text
    • http://vedegisawopuf.epizy.com/28662032940.pdfIn PDF document text
    • http://tolerikaduvutef.rf.gd/jubebubopiwe.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_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 5464 bytes
SHA-256: 6e3dfcd6307d4d459ba3d839bdd6ba78c525a11a0ec478b7d7006a1919b11751
font_01_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 10520 bytes
SHA-256: e9debc7f0ff6c9e3c07e0f06ef6921dbf49b7187048dfda2522e9a6b79593c11

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