Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d153502f3865d9…

MALICIOUS

PDF

80.8 KB Created: 2021-02-25 05:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: af26466b770a38b25f785d60758db48a SHA-1: 39413e71626422ac640bdf088baa537dfeb12ebf SHA-256: 57d153502f3865d91ddb372e18c5b00eb74f7d0735a0395ae508de28414082dc
156 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 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=how+to+install+brake+pad+clips+f350 PDF link annotation
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/gasexigoxupojeludepi.pdfIn PDF document text
    • http://levelupguild.com/finupecelt0.pdfIn PDF document text
    • http://connexion-amelii.xyz/48974881212wuw5s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damokoz.epizy.com/gugarotujujajekeruxuso.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/microelectronic_circuits_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/coreldraw_2019_plugins_free.pdfIn PDF document text
    • http://bujisovi.epizy.com/genamot.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/48133408961.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/elf_costume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/denagedibimuk.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/givofibekup.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/xazijevate.pdfIn PDF document text
    • http://girofili.myartsonline.com/is_nikon_d3400_full_frame.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/vibodimu.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_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 5836 bytes
SHA-256: d5a5bf1bd3801e38e181b0e0132f09b9a4ced37e76a3342360241cfea064dac5
font_01_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 10132 bytes
SHA-256: 4db381b657250deb77d750808a1b8007673cc4436863d350f51b436daefa2562

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