Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aa441d27ff3c71…

MALICIOUS

PDF

87.8 KB Created: 2021-05-29 14:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e8af06d5c7c69b9bfd493914094897a6 SHA-1: b85acfb423cfcb295a4ebbd2d7fc381f90cf5e54 SHA-256: 21aa441d27ff3c71d7f367b6e0dc454d83bde02fe4dc8cc624ba913547df69c2
156 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 0.9995

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=what+are+the+possible+impacts+of+the+4th+industrial+revolution+on+firms+and+employees PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425908/normal_5fe49a6d0a04b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393900/normal_6056b8ce29478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501380/normal_60226299dc981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_5ff1770157789.pdfIn PDF document text
    • https://tinuvireredat.weebly.com/uploads/1/3/4/8/134864568/78cf6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fefe47957d9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369315/normal_5fc7385e176bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420235/normal_6040172183939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_6067962cf19cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475397/normal_6001b7b0c8dfb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4476126/normal_60affb497f039.pdfIn PDF document text
    • https://fefaxunitu.weebly.com/uploads/1/3/4/3/134399706/86c286b8b409565.pdfIn PDF document text
    • https://birafuwufejutik.weebly.com/uploads/1/3/4/5/134598964/kubujudaleze-pazoj-lubulosebilo-xedojasojuse.pdfIn PDF document text
    • https://wasizizinawuj.weebly.com/uploads/1/3/6/0/136096362/xavatobe_vakuzawoweka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_60642bbdc4a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_604f25980b7d7.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4425921/normal_60b1963e444bd.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/7787273.pdfIn PDF document text
    • https://soxixafefude.weebly.com/uploads/1/3/4/4/134434462/167673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5fd0472217dbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410199/normal_5ff2113b56d25.pdfIn PDF document text
    • https://kuzikumivinoli.weebly.com/uploads/1/3/4/2/134235757/pavenefokuwad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 5680 bytes
SHA-256: 15b7ea5bdc140d629de633ee54d1eeab40cfd49094d26d753c7fbeac3c0a98c0
font_01_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 10648 bytes
SHA-256: 00d7ae1a25fb976aa11ef084c14e099ec1e51f725ec97d6dfb0fa30f1dece939
font_02_sfnt_off00014060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14060 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

Open this report in the interactive analyzer, or submit your own file for analysis.